Low Lipo Battery LED Voltage Meter Tester Buzzer Alarm Indicator Single Loudspeaker for 2s 7.4v / 3s 11.1v lipo BatteryFeatures:1.Low pressure alarm is an Alarm that can give 2-3 s.2.Lipoions mobile voltage situation by the LED and alarm.3.This device can give the cell voltage automatically.4.This device can always connect to the battery and the voltage.5.All the time to overdischarging the battery.Description:1.Be sure to attach the Lipoion connector to the connector of this Alarm, at the same time, the negative connectors of battery must connect to the negative connectors of the alarm.2.Quick test for your lipo before flight .3.Small device to check the battery voltage to avoid permanent damage .Specifications:Item Name: Low Lipo Battery LED Voltage Meter Tester Alarm IndicatorColor: RedDimensions: 40 * 19 * 9mm (L * W * H)Net weight: 4gPackage information:Package size:70 * 50* 10mmPackage weight: 4gPoly bag packagePackage Included:1 x Low Voltage Alarm BuzzerNote:Please allow error due to manual measurement, make sure you do not mind before you bid.