1900mA Mini USB Power Bank 1. Mini / Micro USB output, 2. Multi conectors output, 3. inout/outout ... it with PC USB or AC adapterConnect cable and micro USB connector, then insert power bank's input socketConnect ... USB port, or with adaoter with USB port, turn on PC or plug in the adapter.When charging, 4 ... button to off LEDs. When 4 LEDs are keeping on not blink, it means power bank is full charged ...