BX100 Li-ion Lipo Li-poly RC Battery Low Voltage Tester Buzzer Alarm Features: Function of checking your lipo Li-ion cells voltage Function of lower voltage warning before and in flight Automatic protects against reverse connection Test the working state of lithium battery Protect the battery from overcharging or overdischarging Suitable for 1-8s Lipo/Li-ion/LiMn/Li-Fe battery Voltage detection precision: 0.01V Unit voltage display range: 0.5-4.5V Total voltage display range: 0.5-36V 1S test mode voltage range: 3.7-30V Low voltage alarm mode for 2-8S Alarm set value range: OFF- 2.7-3.8V Size: 40mm x 25mm x 11mm. Weight: 13g Note: When the voltage is below the set value, it will buzzer with red LED Light, pre-set value 3.3V, push key which can change the voltage settings and save. The Alarm sounds and red lights to warn you when the battery voltage is becoming lower than default setup or your setup. It can prevent your lipo battery damaged due to low voltage . The default alarm voltage is 3.3v, the min. voltage can be adjusted by the button. Package Includes: 1x BX100 Battery Voltage Meter Tester Alarm