This is a under-voltage used to turn off the 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.Suitable Battery: 12V storage/lithium batteryControl Current: 20AControl Precision: 0.1VVoltage Error: +/- 0.1VColour: as shownMaterial: ABSSize: 7.9 x 4.3 x 2.7cmPackage Contents:2 x Electronic ControllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.