Features: This is a under-voltage switch module used to turn off the power of resistive load in the event of the voltage dropping below a definite value(set under-voltage). If the voltage rises back in 6 seconds, the module will keep load turning on. When the battery voltage increases to a certain value(set over-voltage), the module will automatically turn on load again. Designed with a LED indicator to show if load is cut off or turned on. Both under-voltage cut-off value and over-voltage turn-on value can be adjusted by simply pressing buttons. Specifications: Input Voltage: DC12V Max. Current: 10A Size: 50*48*20mm/1.96*1.89*0.78" Instruction: Load cut off and turn on: For 12V storage battery, set under-voltage (load cut off voltage) as 10.5V, when the battery voltage drops to 10.5V or lower, controller will delay 6 seconds then cut off load. If voltage increases in the delayed 6 seconds, load will keep turning on. Voltage setting: Under the value setting condition as display flashes, press start button to increase voltage, and stop button to reduce voltage. Start button function(setting under-voltage for cutting off load): Under normal voltage display condition, press start button to display under-voltage value. Press and hold start button till display flashes, then press start or stop button to set under-voltage value. Stop button function(setting over-voltage for turning on load): Under normal voltage display condition, press stop button to display over-voltage value. Press and hold stop button till display flashes, then press start or stop button to set over-voltage value. Restore to factory settings: Press and hold start and stop button together till it displays 888 to restore factory settings. Note: When setting, if start voltage cannot be adjusted, you can adjust stop voltage first. This is not a circuit problem or program fault. Package Includes: 1 x Protection Board