★Works with any 1-8s Lipo Li-ion Limn Li-fe RC drone car. | ★Display Mode: cell voltages, total voltages, lowest cell voltage, Remaining capacity. | ★When the voltage is below the set value ,it will buzzer with red LED Light , pre-set value 3.3V. | ★Small Size(40mm x 25mm x 11mm) and light weight(10g),easy to use. | ★Package Includes: 5pcs Alarm Buzzer