1、Adjustable Output: The voltage regulator module supports 5V to 3V 9V 12V 18V 24V multiple output levels to meet the needs of different electronic devices. 2、Stable Current: With current function, the output current can be monitored in real time to stabilize the output and protect the equipment. 3、Protection Function: With a variety of protection mechanisms, such as overload protection, overheating protection, short circuit protection, etc., to protect the safety of the equipment. 4、High Efficiency: High efficiency buck technology and high energy conversion efficiency, low internal transistor temperature, more safe and reliable. 5、Easy Using: The module is small enough to fit in your pocket or carry with you, or you can connect it directly to the power cord for use. 1 x USB Power Supply Module Item Type: USB Power Supply ModuleMaterial: ABSButton:Left side "ON" key: short press - control the output side to turn on or off, calibration mode for minus one unit of voltage or current value; long press - long press more than 3 release, the digital tube off, press any key digital tube to resume display.Potentiometer knob:Indicator light:A: Indicator light indicates that the current digital tube is displaying the current value, and the unit is A.