Main Features: - DIY Power Bank and Charger Custom capacity by 3 x 18650 li-ion battery to make your own power bank, portable external supply, provides your devices enough power. Also a battery charger for 18650 battery, a dual-use item - Dual Inputs 8 Pin and Micro USB dual inputs, just one cable can charge the power bank, easy operation - Dual Outputs Dual outputs, can charge phones, pads or other small electronic devices simultaneously - Independent Circuit Independent battery, charging and discharging at the same time, can work together and not influence each other - LCD Display Screen Each battery independently clearly displays subtitle, easy to read the remaining capacity - Reverse Polarity Protection When it comes to the reverse polarity, the chip inside will automatically identify and cut off the power of the reversed polarity circuit, displays an empty battery level Reversed polarity will not affect the normal operation of other circuits Parameters: Battery: 3 x 18650 li-ion battery ( not included ) Input: 5V Output: 5V / 1A, 2A