Seamless switching between external power supply and battery supply (no delay). Uninterrupted power supply, -starting after power failure, -charging when incoming calls. Four practical functions: lithium battery charging, lithium battery protection, boost output, and UPS switching. The two-color LED indicates the charging status, and the green light is always on when fully , and the charging stops automatically. Type-C interface, through the current . Function Description: UPS function: When the power supply has power, the power supply directly supplies power to the load through the booster circuit, and charges the lithium battery at the same time. Once the power is cut off, the battery path is automatically activated to supply power to the load via the boost circuit. Boost circuit: power up to 20W, rated power up to 15W, BOST boost circuit, built-in 12A high current MOS, efficiency up to 96%, module static power consumption 25mA, 9V output. (The load is recommended to be Less than 15W. Output 5V: current 3A output 9V: current 1.6A output 12V: current 1.2A) Lithium battery protection: overshoot, over-discharge, over-temperature, over-current protection (if it enters the protection state and does not output after misoperation and short circuit, it will automatically activate and resume output when connected to 5V charging). type: module Colour:green Material:PCB Package Contents: 1 x Module Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.