Features Extend battery life: This under-voltage switch controller can be used to turn off the load power when the voltage is lower than the set value, to avoid battery over-discharge and extend battery life Automatically turn on the load: The storage battery module will automatically turn on the load again. When the battery voltage rises to the set value, there is an LED indicator to show whether the battery is under-voltage Simple operation: Low voltage cut off switch is simple and convenient to operate, just press the button to adjust the cut-off and turn-on voltage values. Application: Undervoltage control is suitable for 12V storage battery/lithium battery, the control current is 20A, the control accuracy is 0.1V, and the voltage error is ±0.1V Size: The package of undervoltage switch includes 1 battery undervoltage controller, the size is 8*4.3*2.8cm/3.1*1.7*1.1in, and the weight is about 41g Features: This is 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 battery Control Current: 20A Control Precision: 0.1V Voltage Error: ±0.1V Size: 8*4.3*2.8cm/3.1*1.7*1.1in Weight: 41g(approx.) Restore to Factory Setting: At normal state, press and hold S1 and S2 buttons together, till display shows 888, to restore to factory setting. Package Includes: 1 x Battery Under-voltage Controller Package List