This new product is a mini Mini 5V Uninterrupted Power Supply (UPS) for Fingerprint Machine/Attendance. 

Compatible with most fingerprint device that runs on 5V power supply - for Arduino too.

Tested to give up to 9 hours stand by backup power when there is power failure.

Can be charged and used at the same time

Specs

Input : 5V 2A

Output : 5V 0.8A

Charging time: around 7.5 Hours

LED red when is charging and green when it is full