1PCS 1-8S Low Voltage Buzzer Alarm Lipo Battery Voltage Indicator Tester for RC Car RC Boat RC DroneFeatures:100% Brand new and high Quality.Function of checking your lipo battery 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: ±0.01VUnit voltage display range: 0.5V-4.5VTotal voltage display range: 0.5V-36V1S test mode voltage range: 3.7V-30VLow voltage alarm mode for 2-8SAlarm set value range: OFF-2.7V-3.8VWhen 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 savePackage list:1 * 1-8S Voltage Buzzer Alarm