... 1.Optional color: blue, purple, black, silver,red 2.Have a power indicator 3.long cycle life,low self discharge ... , purple, black, silver,red Main application fielduniversal usage as stand-by power for cell phone, smart phone, iphone series products, Bluetoothmusic ... no less than 200 pieces per item. for iphone 5 battery pack/usb rechargeable battery pack/2200mah power bank external battery pack