Supports QC fast charging 15W synchronous switching boost charging Boost charging efficiency of 94% Configurable with 2 or 3 lithium batteries Adjustable charging current The module is suitable for 3.7V lithium batteries in two series. It is set by shorting, with two series by default. When two series are used, the module's built-in battery balancing function can be used, which is very practical. The input can be a Type-C port or wire bonding. When the Type-C port is connected to a fast charging power supply, it automatically adjust the charging voltage to improve efficiency. If wire bonding is used, the input voltage must be lower than the battery voltage, and the module can only work in boost mode. Input overvoltage and undervoltage protection, adjustable charging timeout protection, output overcurrent, overvoltage, short circuit road protection. Color: As Shown Material: PCB Package Contents: 2*2S board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.