12V Low Voltage Battery Cut-off Automatic Switch On Undervoltage ProtectionOOTDTYChunds: This is a slave voltage switch used to shut down the load power when the voltage drops below a preset value. When the battery voltage rises to the set value, the module will automatically turn the load back on. Designed with LED indicator to show if the battery is energized. Both the value of the off and on voltage can be adjusted simply by pressing the buttons. This controller will help you protect your battery from over-draining and prolong the life of your battery. Specifications:Suitable Battery: 12V Storage/Lithium Battery Current Regulation: 20A Control Accuracy: 0.1V Voltage Error: ± 0.1V Measurement: 8*4.3*2.8cm/3.1*1.7*1.1inWeight: 40g (Approx.) Restore to Factory Settings:In the normal state, press and hold the S1 and S2 buttons together until the display shows 888 to restore the factory settings. Package Included:1 x Battery Undervoltage Controller