Features 1、Practical Use: Can also work as voltmeter, ammeter and power meter, an excellent replacement for multimeter with clear view and easy operation. 2、USB Interface: The on board USB interface can easily charge your digital products. And the USB output voltage is the same as the module output voltage, not a fixed 5V output, please confirm before charging the USB device. 3、Functionality: Can be used as an ordinary buck module with over current protection, a charger for various batteries, and a high power LED constant current drive module. 4、2 Work Modes: There are 2 modes, constant voltage and constant current, and an indicator light indicates which mode the module is currently in. 5、Easy Setting: When used as a lithium battery charger, you can set the float voltage and charging current, and there is an indicator light to indicate whether it is charging or fully charged. 6、Safe Working: With current limiting protection function, the module will not be burnt out even if the output is short circuited. 7、High Accuracy: The on board voltmeter and ammeter can be self calibrated, and there will never be inaccurate problems. Specification Package List 1 x Power Supply Buck Module 4 x Screw ans Nut Set 1 x Heat Sink