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: Storage/lithium batteryPower Supply Voltage: DC12VBattery Voltage: 3.7V~96VControl Voltage: 3V~120VControl Current: 20AControl Precision: 0.1VVoltage Error: ±0.1VSize: 7.8*4.3*2.3cm/3.1*1.7*0.9inWeight: 42g(approx.)Voltage Setting Method:At setting mode(when display flashes), S1 button increases voltage value(add), S2 button reduces voltage value(minus).S1 Under-voltage Setting(load stop):At normal mode, press S1 button to show under-voltage value. Press and hold S1 button till display flashes, then adjust under-voltage value by pressing S1 and S2 button.S2 Over-voltage Setting(load start):At normal mode, press S2 button to show over-voltage value. Press and hold S2 button till display flashes, then adjust over-voltage value by pressing S1 and S2 button.Restore to Factory Setting:At normal state, press and hold S1 and S2 buttons together, till display shows 888, to restore to factory settingNote: If S1 cannot be used to add voltage, set S2 first; if S2 cannot be used to minus voltage, set S1 first.Package Includes:1 x Battery Under-voltage Controller