ITEM NAME:6-40V LED Battery Charger Discharger Board Under /Over Voltage Protect Module HY Descriptio n Feature: 1. Battery charge and discharge control, automatically set off after setting; 2. Can set the charging and discharging time; 3. With serial communication function, real-time monitoring of the working status of the relay through the serial port; 4. Additional signal output, when the relay meets the.Material: power module. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted. We'd like to settle any problem in a friendly manner.