-This product is using for detecting 1S-8S lithium battery
-To know the working state of your battery anytime, protect the battery from overcharge and over discharge.
-The red LED will flash,the buzzer will beeping when the voltage is below the set point.
-The factory default setting is 3.3V, press the button to change the voltage setting, and it will save your current setting automatically.
1 x Voltage Buzzer Alarm