1.Optional color: blue, purple, black, silver, ... 21mmWeight (approx.):80gCycle Life:No less than 500 cyclesDescription 1. Cylindrical lithium ion battery cell 2. High capacity ... red Main application fielduniversal usage as stand-by power for cell phone, smart phone, iphone series products, Bluetoothmusic ... , and differentiates input port from output port.4. When charge for the power bank, do not use it 5 ...