LPT003 Battery Voltage Tester, Volt Meter-monitor, Buzzer Alarm 1-8S
It could be used in the shop or on the field as battery Voltage Tester-Meter also could be installed on board as battery Voltage monitor, buzzer - Alarm.
It is a safety device allowing the battery to be use more safely.
When the voltage is below the set value, it will buzzer with red LED light (pre-set value 3.3V)
Pushing key you can change the voltage settings and save.