Product Introduction: When the load current is continuously less than 50mA, the output will be turned off. It supports external buttons. Connect the buttons to the K point and the output negative pole. Short press to turn on the power display and turn on the 5V output. Two consecutive short presses will turn off the power display and turn off the 5V output. When the charging current drops to 100mA after reaching the final float charging voltage, the charging cycle will be automatically terminated. When the battery voltage drops below 4.1V, the charging cycle starts again. When the battery voltage drops below 2.8V, the battery will be pre charged with a current of 180mA. The back of the product provides the USB-A base welding position, which can be manually installed to support charging and discharging at the same time.