Suitable for 1-8S Lipo / Li-ion / LiMn / Li-Fe.
The buzzer alarm pre-set value is 3.3V, push key which can change the voltage settings and save.
When the battery voltage is too low, the bazzer alarm will sounds and the LED indicator will turn red light.
It can test the working state of lithium battery, to protect the battery from overcharging or over-discharging.