This product is suitable for non-power-off applications of equipment during power outages. It uses external power supply when there is power and automatically and seamlessly switches to battery power supply when there is a power outage. Suitable for routers, cameras, development boards and other equipment, it can seamlessly switch to battery power supply when power is off, and the network is continuous when power is off. Seamless switching between external power supply and battery dual power supply (no delay). Uninterrupted power supply, self-starting when power outage, self-charging when power comes in. Two-color LED indicates the charging status, the green light is always on when full, and charging automatically stops. Type-C interface, large passing current Function Description: 1. UPS function: When the power supply is powered, the power supply directly supplies power to the load through the boost circuit and charges the battery at the same time. Once the power supply is cut off, the battery path is automatically activated to supply power to the load through the boost circuit. 2. Boost circuit: Peak power can reach 20W, rated power can reach 15W, BOST boost circuit, built-in 12A high current MOS, efficiency up to 96%, module static power consumption 25mA, 5V output (Recommended normal load is Less than 15W. Output 5V: current 3A) 3. Battery protection: overshoot, over-discharge, over-temperature, over-current protection (if it enters the protection state and does not output after a short circuit by mistake, it will automatically activate and restore the output when connected to 5V charging). Output voltage:5V Colour:Green & Black Material:PCB+electronic components+Plastic Package Contents: 3 x Type-C 15W 3A 18650 Lithium Battery Charger Module