LC Prime 4 PCS 1-8S Lipo/Li-ion/Fe Battery Voltage 2IN1 Tester Low Voltage Buzzer Alarm plastic black, by 2 IN 1: 2 in 1 with LED voltage indicator and low voltage alarm; Default value is 3.3V, when voltage is below the setting, it wills buzzer very loudly with red LED light VALUE SETTINGS KEY: A push key can change and save the value settings LIGHT WEIGHT: Light weight, compact and high quality BATTERY TYPE: Use for test 1-8S Lipo/Li-ion/LiMn/Li-Fe battery WHAT YOU GET: LC Prime 4 X 1-8S Battery Voltage 2IN1 Tester Low Voltage Buzzer Alarm. And our 60-day warranty and friendly customer service. Great choice for & Gift idea.