Features:Thisis a under-voltage switch controller used to turn off the power of load in the event of the voltage dropping below a set value.When the battery voltage increases to a set value, the module will automatically turn on load again.Designed with a LED indicator to show if battery is under-voltage.Both turn-off and turn-on voltage value can be adjusted by simply pressing buttons.This controller will help you to protect battery from over-discharging and prolong battery life.Specifications:Suitable Battery: 12V storage/lithium batteryControl Current: 20AControl Precision: 0.1VVoltage Error: 0.1VSize: 8*4.3*2.8cm/3.1*1.7*1.1inWeight: 41g(approx.)Restore to Factory Setting:At normal state, press and hold S1 and S2buttons together, till display shows 888, to restore to factory setting.Package Includes:1 x Battery Under-voltage Controller