... to lower than 3.7V will alarm, just need to set the 3.7V is ok. Specification:1. Voltage detection precision ... 5. Low voltage Buzzer alarm mode for 2-8S6. Alarm set value range:OFF-2.7V-3.8V7. When the voltage ... is below the set value,it will buzzer with red8. LED light,pre-set value 3.3V,Push key which ...