Features: brand new and high quality 12V Battery Charging Controller Type:It is a 12V battery charge controller.It works with 12V batteries.The controller controls the state of charge of the battery through the voltage of the battery.The controller automatically stops the battery charging when overvoltage occurs,and automatically starts the battery charging when undervoltage occurs. Its undervoltage value and overvoltage value can be set by button. It has a memory preservation function. It has a digital display that can display the battery voltage. Battery overvoltage will automatically stop,undervoltage will automatically open. 12V Battery Undervoltage Controller:It is a 12V battery undervoltage controller.It mainly performs undervoltage protection for 12V battery.Set an undervoltage value and a startup value.When the battery voltage is lower than the undervoltage value,the module will automatically disconnect the load from the load;when the battery is higher than the startup value,the module will automatically connect the load. It has the function of memory preservation. It has a digital display that can display real-time voltage. It has undervoltage setting button and start setting button,which is easy to operate. It has a delay function,the load will be disconnected after the voltage is lower than the undervoltage value for 6 seconds to avoid false disconnection. Specifications: Product Name:12V Battery Controller Load Power:20A relay Size:82x42mm Installation Size:94mm Work Temperature:-25~85 Work Humidity:5%~95%RH Note: Please allow 1-2cm measuring deviation due to manual measurement. Due to the monitor difference and light effect, the actual color of the item may be slightly different from the color shown on the pictures. Thanks! Package includes: 1 x Battery Controller