This is a Mini UPS. By using this, you will get 4-5 hours of backup for your router/ONU even if there is no electricity. This UPS uses three parallel 3.7V batteries with BMS, and the circuit model is Mini router ups board 40w V2.6. To fully charge the batteries in this UPS, an ADOP LITHIUM BATTERY CHARGER is included. MODEL: 12620, INPUT: AC100-240V 50/60Hz, OUTPUT: DC12.6V-2A. This adapter is capable of fully charging these three 3.7V batteries. I made this UPS with my own hands. It comes with 2 cables.