2pcs 1-8S 2in1 Indicator RC Li-ion Lipo Battery Tester Low Voltage Buzzer Alarm 2-in-1 1~8S Lipo Battery Low Voltage Buzzer Alarm for RC Helicopter 2pcs 2Pcs 1-8S Indicator RC Li-ion Lipo Battery Tester Low Voltage Buzzer Alarm Features: Brand New & High Quality. Function of checking your lipo cells voltage Voltage display function and low voltage alarm funtion. Use for 1-8s Lipo/Li-ion/LiMn/Li-Fe. Protect the battery from overcharging or overdischarging Test the working state of lithium battery Automatic protects against reverse connection Specifications: Voltage detection pricision: 0.01V. Unit voltage display range: 0.5V-4.5V. Total voltage display range: 0.5V-36V. 1S test mode voltage range: 3.7v-30v. Low voltage alarm mode for 2-8S. Alarm set value range: OFF-2.7V-3.8V. 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. Package size: 6 * 4 * 1cm / 2.4 * 1.6 * 0.4in Package weight: 25g / 0.9oz Package list: 2 * 1-8S Voltage Buzzer Alarm