Features:1, Simple and practical battery discharge protection board.2, Using variable resistor.3, Green LED lights on when working, lights off when disconnected.4, Discharging protection for a variety of 12V accumulato5, Disconnected automatically, re-connect manuallySpecifications:Adjustable, potentiometer counterclockwise is low, clockwise is high. Factory Value: 12 V System: 10 VPCB Size: 35 x 45 mmPackage includes:1 x Protection ModuleNote:1, Inductive load(e.g. motors) can not be used. 30 A is the load current that relay contact allow, it is not current of accumulator.3, Please allow 1-3 mm error due to manual measurement. Thanks for your understanding.4, Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.