... to use Compact design Easy to carry ItemBL-400ForFix for various mobile phones and devicesCapacity4000 mAhWeight200gInputDC 5V-1000 ... High-capacity Polymerzation tungsten, capacity 5000-20000mAh, durable. Support for charging, no memory effect, up to 1000 charge cycles ... standard USB output, fit for more than 95% brand mobile phones which on the market. portable move usb power charger for iphone,ipod