20 Best Spectra S1 Or S2 [2024]

Are you looking for the best Spectra S1 Or S2? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Spectra S1 Or S2.

We Recommended:

# Preview Product
1 Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange... Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange...
2 Maymom Breastmilk Storage Bag Adapters Compatible with Avent, Spectra S1, S2 Pumps with Wide Mouth... Maymom Breastmilk Storage Bag Adapters Compatible with Avent, Spectra S1, S2 Pumps with Wide...
3 Maymom Pump Parts Compatible with Spectra S2 Spectra S1 Spectra 9 Plus Breastpump, Incl 24mm Flange... Maymom Pump Parts Compatible with Spectra S2 Spectra S1 Spectra 9 Plus Breastpump, Incl 24mm...
4 Zohzo Lauren Breast Pump Bag - Portable Tote Bag Great for Travel or Storage – Includes Padded... Zohzo Lauren Breast Pump Bag - Portable Tote Bag Great for Travel or Storage – Includes Padded...
5 Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange to Use... Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange to...
6 Maymom Breastmilk Storage Bag Adapters Compatible with Spectra S1, S2 Pumps ; 2 Duckbill Valves... Maymom Breastmilk Storage Bag Adapters Compatible with Spectra S1, S2 Pumps ; 2 Duckbill Valves...
7 Maymom Pump Parts Compatible With Spectra S2 Spectra S1, Incl Flanges (28mm) Valves Tubes Bottles... Maymom Pump Parts Compatible With Spectra S2 Spectra S1, Incl Flanges (28mm) Valves Tubes Bottles...
8 PumpMom Replacement Silicone Membrane, for Spectra S2 S1 and 9 Plus Breastpump Backflow Protector... PumpMom Replacement Silicone Membrane, for Spectra S2 S1 and 9 Plus Breastpump Backflow Protector...
9 Papablic Breastmilk Storage Bag Adapters for Spectra S1 S2, Avent Comfort Wide-Mouth Flanges to Pump... Papablic Breastmilk Storage Bag Adapters for Spectra S1 S2, Avent Comfort Wide-Mouth Flanges to...
10 Breastmilk Storage Bag Adapters for Spectra S1 S2 Pumps, Avent Comfort Wide Mouth Flange Pump to Use... Breastmilk Storage Bag Adapters for Spectra S1 S2 Pumps, Avent Comfort Wide Mouth Flange Pump to...
11 Lunies Breast Pump Bag Diaper Tote Bag, Double Layer Breastmilk Storage Bag for Travel, Large... Lunies Breast Pump Bag Diaper Tote Bag, Double Layer Breastmilk Storage Bag for Travel, Large...
12 Maymom Silicone Membrane Suitable for Spectra S1 Spectra S2, 9 Plus Backflow Protector and Maymom... Maymom Silicone Membrane Suitable for Spectra S1 Spectra S2, 9 Plus Backflow Protector and Maymom...
13 Teamoy Breast Pump Bag Compatible with Spectra S1,S2, Medela and Cooler Bag, Large Breast Pump... Teamoy Breast Pump Bag Compatible with Spectra S1,S2, Medela and Cooler Bag, Large Breast Pump...
14 PumpMom Pump Bottle Adapter, Baby Bottle Thread Changer Converter for Spectra S1 S2 Pump Wide Mouth... PumpMom Pump Bottle Adapter, Baby Bottle Thread Changer Converter for Spectra S1 S2 Pump Wide...
15 Portable Breast Pump Bag, Spectra S1 Bag. Belt Bag Pumping Bag - Pump-A-Porter - Idaho Jones | Hands... Portable Breast Pump Bag, Spectra S1 Bag. Belt Bag Pumping Bag - Pump-A-Porter - Idaho Jones |...
16 Breastfeeding in a Modern World Breastfeeding in a Modern World
17 Teamoy Breast Pump Bag Tote with Cooler Compartment for Breast Pump, Cooler Bag, Breast Milk Bottles... Teamoy Breast Pump Bag Tote with Cooler Compartment for Breast Pump, Cooler Bag, Breast Milk...
18 Milk Milk
19 Maymom Pump Parts Compatible with Spectra S2 Spectra S1, 24 mm Flange Valve Tube Bottle Backflow... Maymom Pump Parts Compatible with Spectra S2 Spectra S1, 24 mm Flange Valve Tube Bottle Backflow...
20 Maymom Backflow Protector Duckbill Valve Compatible with Spectra S1 Spectra S2 Replace Spectra... Maymom Backflow Protector Duckbill Valve Compatible with Spectra S1 Spectra S2 Replace Spectra...
Bestseller No. 1
Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange...
  • 3rd Generation Genuine Maymom bottle size changer includes an anti-leaking & anti slip o-ring; designed to avoid leaking when a mother bent over...
  • Allow Avent and Spectra S1 and Spectra S2 flanges to use with standard sized bottles like medela bottles, ameda bottles and original Dr. Brown Bottles...
  • We recommend that you use a bottle-stand (such as ASIN B00PRPLRYQ) as well to reduce the tipping-over of the bottle.
  • BPA free, dishwasher safe; FDA compliant for food contacts. Every batch is tested for safety. Test reports are online on Maymom's website for your...
  • From a brand you can trust - Maymom and USA based customer service.
Bestseller No. 2
Maymom Breastmilk Storage Bag Adapters Compatible with Avent, Spectra S1, S2 Pumps with Wide Mouth...
  • The patented adapters (2 pc in this listing) allow you to pump directly into most popular breastmilk storage bags like Lansinoh and Nuk. Patented in...
  • No milk loss due to transferring from collection bottles to bags; Clear in color for seeing the milk coming out during pumping.
  • Fits most wide neck breastshields (Avent, Spectra S1/S2 wide mouth flanges);
  • NOTE: There is stainless steel in the product. DO NOT place the product in a microwave oven or steamer bag for cleaning. Use boiling water for 2-3 min...
  • Material: Heavy duty polypropylene(PP), BPA free. Stainless steel spring.
Bestseller No. 3
Maymom Pump Parts Compatible with Spectra S2 Spectra S1 Spectra 9 Plus Breastpump, Incl 24mm Flange...
  • "Maymom aftermarket PUMP PARTS FOR SPECTRA S2 SPECTRA S1 SPECTRA 9 PLUS BREASTPUMPS. Made by Maymom. Not Original Spectra Parts. Incl 2 Flanges...
  • "AFTERMARKET PARTS MADE BY Maymom. INTERCHANGEABLE WITH SPECTRA PARTS. All parts are interchangeable with Spectra Pump Parts. Can be used with Spectra...
  • "USED WITH WIDE-MOUTH BOTTLES ONLY. Use this kit with Spectra bottles, Avent bottles, and Maymom wide mouth bottles. DOES NOT work with OTHER WIDE...
  • "DIFFERENT FLANGE SIZE AVAILABLE: 19mm, 21mm, 24mm, 25mm, 27mm, 28mm, 30mm, 32mm. Refer to size selection guide in product photo to choose the right...
  • "IN RETAIL PACK. All parts can be sterilized with water steam or boiling water. Do not contain any BPA. Tested by independent labs for safety.
Bestseller No. 4
Zohzo Lauren Breast Pump Bag - Portable Tote Bag Great for Travel or Storage – Includes Padded...
  • ♥ ♥ ♥ INCLUDES: Mesh Drawstring Wash & Store Bag for breast shields and parts PLUS Detachable Crossbody Strap ♥ ♥ ♥
  • ♥ ♥ ♥ INCLUDES: Mesh Drawstring Wash & Store Bag for breast shields and parts PLUS Detachable Crossbody Strap ♥ ♥ ♥
  • ♥ ♥ ♥ INCLUDES: Mesh Drawstring Wash & Store Bag for breast shields and parts PLUS Detachable Crossbody Strap ♥ ♥ ♥
  • ♥ Spacious zip-down WORKSTATION [wipes clean] with picture holder + 2 storage pockets to hold creams, breast pads, etc.
  • ♥ DOUBLE XL side compartments - fits milk cooler and most portable breast pumps
Bestseller No. 5
Maymom 3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange to Use...
  • 2x 3rd Generation Genuine Maymom bottle size changer includes an anti-leaking & anti slip o-ring; designed to avoid leaking when a mother bent over...
  • Allow Avent and Spectra S1 and Spectra S2 flanges to use with standard sized bottles like medela bottles, ameda bottles (narrow mouth) and original...
  • We recommend that you use a bottle-stand (such as ASIN B00PRPLRYQ) as well to reduce the tipping-over of the bottle.
  • BPA free, dishwasher safe; FDA compliant for food contacts. Every batch is tested for safety. Test reports are online on Maymom's website for your...
  • From a brand you can trust - Maymom and USA based customer service.
Bestseller No. 6
Maymom Breastmilk Storage Bag Adapters Compatible with Spectra S1, S2 Pumps ; 2 Duckbill Valves...
  • The patented adapters (2 pc in this listing) allow you to pump directly into most popular breastmilk storage bags like Lansinoh and Nuk. Patented in...
  • No milk loss due to transferring from collection bottles to bags; Clear in color for seeing the milk coming out during pumping.
  • Fits most wide neck breastshields (Spectra S1/S2 wide mouth flanges);
  • NOTE: There is stainless steel in the product. DO NOT place the product in a microwave oven or steamer bag for sterilization. Use boiling water for...
  • Material: Heavy duty polypropylene(PP), BPA free. Stainless steel spring.
Bestseller No. 7
Maymom Pump Parts Compatible With Spectra S2 Spectra S1, Incl Flanges (28mm) Valves Tubes Bottles...
  • "Product Content: 28mm Flange (x2 Large Flange), Backflow Protector(x2), Tube(x2), Duckbill Valve (x2), Bottle with a Two-Piece Travel Cap (x2). All...
  • "Maymom-made products. Not Original Spectra S1 Accessories. Not Original Spectra S2 Accessories. Not Original Spectra Pump Parts. All pump parts made...
  • "Maymom pump parts perform as well as OEM parts. Interchangeable and compatible with Spectra pump parts. Ideal Spectra replacement for Spectra...
  • "The two-piece cap of Maymom bottle features rewritable surface top for labeling date or baby's name for daycare or daily storage use. Write with...
  • "Comply with FDA regulations for plastic materials that contact food. Material does NOT contain BPA. Can be sanitized with, boiling water, water steam...
Bestseller No. 8
PumpMom Replacement Silicone Membrane, for Spectra S2 S1 and 9 Plus Breastpump Backflow Protector...
  • COMPATIBLE MODELS - 4 Replacement Silicone Membranes for Spectra Backflow Protectors and Nenesupply Backflow Protectors.
  • SAFE MATERIAL - Made with Food Grade Silicone, BPA free.
  • THIS IS AFTERMARKET PART MADE BY PumpMom. Not Original Spectra S2 Accessories.
  • All items packaged in retail pack, sealed by manufacturer for best protection and hygiene.
  • 100% MONEY BACK GUARANTEE - If you experience any issues we offer a complete No Questions Asked Money Back Guarantee.
Bestseller No. 9
Papablic Breastmilk Storage Bag Adapters for Spectra S1 S2, Avent Comfort Wide-Mouth Flanges to Pump...
  • Compatible Models: For Avent, Spectra S1/S2 wide-mouth flanges to pump directly into breastmilk storage bags (like Lansinoh, NUK milk bags).
  • Pump into Bags: Ideal for pumping directly into breastmilk storage bag. No milk loss due to transferring from collection bottles to breastmilk bags....
  • Notes: Equipped with stainless steel spring. DO NOT clean or sterilize this adapter in any microwave oven. Use boiling water for 3-5 minutes instead.
  • Material: Food Grade Polypropylene(PP), BPA free, Stainless steel spring.
  • Top Customer Serrvice: If you experience any issues, we here at Papablic CAN ensure that you will always receive an apology and unmatched customer...
Bestseller No. 10
Breastmilk Storage Bag Adapters for Spectra S1 S2 Pumps, Avent Comfort Wide Mouth Flange Pump to Use...
  • COMPATIBLE MODELS - Breastmilk storage bag clip allow wide mouth flange breastpumps to pump directly into Lansinoh and Nuk Breastmilk Storage Bags
  • PUMP DIRECTLY INTO THE BAGS - You can pump directly into the most breastmilk storage bags and don't lose milk in transfers. DO NOT hold the clip area...
  • SAFE MATERIAL - Made with Food Grade Polypropylene(PP), BPA free. Stainless steel spring. NOTE: DO NOT place the product in microwave oven. Use...
  • EASY TO CLEAN - You just need a bottle brush, soap, and water that can remove the dirt in your adapter.
  • 100% MONEY BACK GUARANTEE - If you experience any issues we offer a complete No Questions Asked Money Back Guarantee.
Bestseller No. 11
Lunies Breast Pump Bag Diaper Tote Bag, Double Layer Breastmilk Storage Bag for Travel, Large...
  • WIDE OPEN & LARGE CAPACITY: The breast pump tote bag has a wide opening and up to 15 pockets including insulated pockets, 14" laptop pocket, phone...
  • LUGGAGE SLEEVE: This stylish pump bag features luggage sleeves, perfect for working mom who need to travel. Fix it on your luggage and make it easier...
  • SANITARY AREA::We thought of everything,When front pocket that opens all the way down and can be used as a sanitary set up station.Thanks to the...
  • STYLISH & PROFESSIONAL:We keep the working mum in mind and designed this breast pump bag for daily use.It has stylish looks,No one knows that you...
  • SUITABLE for MOST ELECTRIC PUMPS:A couple of big side pockets suitable for most electronic breast pump on the market like Spectra S1,S2 Electric...
Bestseller No. 12
Maymom Silicone Membrane Suitable for Spectra S1 Spectra S2, 9 Plus Backflow Protector and Maymom...
  • What you get: 4 pcs of membranes; after market silicone membrane for Maymom backflow protector (both short and long stem) and Spectra S1/S2 backflow...
  • Change the silicone diaphragms regularly to optimize the performance of your breastpump
  • Stronger material for improved performance
  • It does not fit the old version of spectra backflow protector; see photo for details
Bestseller No. 13
Teamoy Breast Pump Bag Compatible with Spectra S1,S2, Medela and Cooler Bag, Large Breast Pump...
  • BREAST PUMP TRAVEL BAG: The pumping bag fits for most breast pump (Such as Spectra S1, Spectra S2 and Medela) and cooler bag. NOTE: No Breast Pump and...
  • UNIQUE DESIGN: Sideways Opening Pockets access to open enough, easier to put your breast pump and cooler bag in and take out.
  • LARGE CAPACITY: Many insert pockets to store all your accessories, 3 insulated pockets keep breastfeeding milk warm, A sleeve can fit laptops or...
  • This Professional Breast Pump Bag is made of heavy-duty and durable nylon material. Back extra breathable padded provide easeful and maximum back...
  • Dimension: L15.2" x W8" x H16.5". Portable breast pump carrying bag great for working moms, professionals, executives and moms on the go!
Bestseller No. 14
PumpMom Pump Bottle Adapter, Baby Bottle Thread Changer Converter for Spectra S1 S2 Pump Wide Mouth...
  • COMPATIBLE MODELS - Allow Avent and Spectra S1/S2 widemouth flanges to use with standard sized bottles. Compatible with Medela, Ameda, Dr. Brown...
  • LEAK-PROOF - NO LEAKS BETWEEN THREADS, designed to avoid leaking when a mother bent over during pumping.
  • EASY TO CLEAN - You just need a bottle brush, soap, and water that can remove the dirt in your adapter.
  • SAFE MATERIAL - Made with Food Grade PP, Dishwasher top rack safe. Can be sterilized in water steam or boiling water.
  • 100% MONEY BACK GUARANTEE - If you experience any issues we offer a complete No Questions Asked Money Back Guarantee.
SaleBestseller No. 15
Portable Breast Pump Bag, Spectra S1 Bag. Belt Bag Pumping Bag - Pump-A-Porter - Idaho Jones | Hands...
  • SAVE YOUR GOOD BELT FOR A NIGHT OUT: Moms all over the world are threading their Spectra Breast Pump through belts, hanging them off carriers and...
  • AND, SAVE TIME AND HASSLE: Simply pop the belt bag around your waist, insert your Spectra S1 and off you go! Laundry, dishes or simply reading a...
  • PADDED, COMFORTABLE AND EASY TO HANDLE: Your breast pump hands free belt bag is fully padded inside and out. That means comfort for you and security...
  • PURPOSE-BUILT FOR YOU, AND SPECTRA (FITS OTHER PUMPS TOO): Specifically designed for Spectra S1. It also fits other mains-powered pumps if used with a...
  • EMPOWERED PUMPING STARTS HERE: If any manufacturing issues show up in your belt bag within the first 12-Months, we will replace or refund immediately....
Bestseller No. 16
Breastfeeding in a Modern World
  • Amazon Prime Video (Video on Demand)
  • Louise James (Actor)
  • Louise James (Producer)
  • English (Playback Language)
  • English (Subtitle)
Bestseller No. 17
Teamoy Breast Pump Bag Tote with Cooler Compartment for Breast Pump, Cooler Bag, Breast Milk Bottles...
  • DUAL PURPOSES: One compartment is for most breast pumps(like Spectra S1, Spectra S2 and Medela), the other is for cooler bag, breast milk bottles,...
  • LARGE CAPACITY: This Electric Breast Pump Tote Bag has 2 side mesh pouches + 1 front pouch + 1 back zipper pocket and 1 inside zipper pocket that...
  • PREMIUM QUALITY: Made of water-resistant nylon material. Wipeable, leakproof and hot-pressing lining keeps breast milk, lunch, snacks cold or warm....
  • Dimensions: Top Compartment: L10’’ x W8’’ x H 6.8’’; Bottom Compartment: L10’’ x W8’’ x H 6.7’’. Elegant design is suitable...
  • FUNCTIONAL: This Breast milk cooler bag can also be a lunch bag, a diaper bag or a travel bag. A best gift for breastfeeding moms or working mothers...
Bestseller No. 18
Milk
  • Amazon Prime Video (Video on Demand)
  • Noemi Weis (Director) - Noemi Weis (Writer) - Noemi Weis (Producer)
  • English (Playback Language)
  • English (Subtitle)
Bestseller No. 19
Maymom Pump Parts Compatible with Spectra S2 Spectra S1, 24 mm Flange Valve Tube Bottle Backflow...
  • Kit Contents: 2 Flanges ( 24mm), 2 Duckbill Valves, 2 Backflow Protectors, 2 Tubes, 2 Bottles (with One-Piece Travel Cap). Compatible with Spectra S2,...
  • All pump parts made by Maymom. Not Original Spectra S2 Accessories. Not Original Spectra S1 Accessories. Not Original Spectra Pump Parts
  • Compatible and interchangeable with Spectra pump parts. Same suction power as OEM parts. Replace Spectra Flanges, Spectra Duckbill Valves, Spectra...
  • The One-piece cap of Maymom bottle includes sealing ring for secure seal. NO waste of milkdrop. Design for travel and storage of formula or breast...
  • Material does NOT contain any BPA. Can be sanitized with water steam, boiling water or microwave-steam bags. Comply with FDA regulations for plastic...
Bestseller No. 20
Maymom Backflow Protector Duckbill Valve Compatible with Spectra S1 Spectra S2 Replace Spectra...
  • What You Get: 2x backflow protectors (including 2 large caps, 2 small caps, and 2 silicone diaphragms.) and 6x duckbills. Maymom backflow protector...
  • COMPATIBLE with Spectra S1 Spectra S2 Spectra 9 Plus breast pump. The duckbill valves are also compatible with Spectra Dew 350. The parts are also...
  • "SAME SUCTION POWER AS OEM PARTS: Maymom duckbill valves are compatible with Spectra Flange and Maymom Flange. Maymom backflow protectors are...
  • CLOSED SYSTEM. With Maymom backflow protectors, no milk will enter the tubing, so the tubing will remain clean. The breastpump parts can be sanitized...
  • BPA/DEHP FREE. IN RETAIL PACK.; Comply with EU and USA FDA regulations for materials that contact food. Tested by independent labs for quality and...

Having trouble finding a great Spectra S1 Or S2?

This problem is well understood by us because we have gone through the entire Spectra S1 Or S2 research process ourselves, which is why we have put together a comprehensive list of the best Spectra S1 Or S2s available in the market today.

After hours of searching and using all the models on the market, we have found the best Spectra S1 Or S2 for 2023. See our ranking below!

How Do You Buy The Best Spectra S1 Or S2?

Do you get stressed out thinking about shopping for a great Spectra S1 Or S2? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Spectra S1 Or S2, which is why we have assembled a comprehensive list of the greatest Spectra S1 Or S2 available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Spectra S1 Or S2 that you consider buying. Your questions might include the following:

  • Is it worth buying an Spectra S1 Or S2?
  • What benefits are there with buying an Spectra S1 Or S2?
  • What factors deserve consideration when shopping for an effective Spectra S1 Or S2?
  • Why is it crucial to invest in any Spectra S1 Or S2, much less the best one?
  • Which Spectra S1 Or S2 are good in the current market?
  • Where can you find information like this about Spectra S1 Or S2?

We’re convinced that you likely have far more questions than just these regarding Spectra S1 Or S2, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Spectra S1 Or S2, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Spectra S1 Or S2. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Spectra S1 Or S2 buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Spectra S1 Or S2 currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Spectra S1 Or S2 has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Spectra S1 Or S2?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Spectra S1 Or S2.
  5. Customer Ratings: Number ratings grade Spectra S1 Or S2 objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Spectra S1 Or S2.
  7. Product Quality: You don’t always get what you pay for with an Spectra S1 Or S2, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Spectra S1 Or S2 is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Spectra S1 Or S2 information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Spectra S1 Or S2 is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

Related Post:

FAQ:

Q: How to use the spectra S2?

A: How to use spectra s2 in car. The second is a power bank that you can use rechargeable batteries with. The steps to using the spectra pumps include assembling the pump parts, and then understanding how to use the settings on the pump. It has the adjustable suction level for a more natural flow of milk.

Q: How to use spectra S1 breast pump?

A: back flow protector (this is the important part that will keep your Spectra S1 as closed system and thus prevent moisture to enter the pump motor) Press the power button to turn on / off your breast pump. Now you need to know that Spectra always turns on in expression mode, unlike Medela which automatically turns on with let-down mode.

Q: What is spectra S2 plus?

A: – The Spectra S2 is less expensive than the Spectra S1. This might be the main deciding factor for you to choose this model – The Spectra S2 weighs a little bit lighter than the Spectra 1 – This double electric breast pump can be used right away – It’s also possible to connect the Spectra S2 with a car charger