About this item Designed for MCU users, this device connects to the microcontroller for about 20 seconds to provide a low level that allows the module to continue functioning. It features low-level trigger mode (ground). 4 in 1 module for Charging / Discharging / Battery Protection / Battery Level Indication. Protection functions include over-current, overvoltage, over-temperature, and short circuit protection for lithium batteries. The output activates automatically when the load is first connected. If the load is less than 50mA, the output automatically closes after 30 seconds; if the load exceeds 50mA, the output remains active. High power efficiency with discharge efficiency up to 96%. In discharge mode, trigger the KEY port once to activate the output; continuously trigger the KEY port twice to deactivate it. Suitable for applications such as converting solar panel energy to mobile phone charging, car charging retrofits, driving recorder power supplies, household power supply, int