Maxway (2B/MW) External Battery Pack Power bank Charger 4000mAh (Black, Super Slim with 1 USB 1.0A Port; A USB Wall Charger Included) Premium quality rechargeable Lithium-ion Polymer battery with 4000mAh capacity Ultra slim and compact design makes it perfectly portable and convenient to carry even in a pocket, this battery pack is an ideal companion for iPhone and other usb-powered mobile phones. It holds enough power to charge up the iPhone 4s for 2.5 times Guaranteed reliability and safety by multiple-protection : over-discharge protection, overcharge protection, over voltage protection, overcurrent protection, overload protection, short circuit protection, and overheat protection Monitor battery level easily through LED indicators, so that you will always know when it needs to get recharged Contents of Package: ) Maxway Portable Charger*1; ) Maxway Wall Charger*1; ) USB Cable*1; ) Connector*2; ) Velvet Pouch*1