Easy to use - compatible with all 2-8S Lipo / LiFe / LiMn / Li-ion batteries Small size - 40mm x 25mm x 11mm, light weight: 10g / 1 pc. hum when reaching low voltage point Display mode: battery cell voltages, total voltages, lowest cell voltage, remaining capacity of the battery. This is a digital voltage checker with the alarm. This voltage checker is compatible with all 2-8S Lipo / LiFe / LiMn / Li batteries -ion An alarm sounds when you reach the low voltage pointwhich is extremely useful in flight when the indicator lights are not visible. Specifications:< /p> Designed for 2-8S Lipo / Li-ion / LiMn / Li-Fe Cells: 2-8S Size: 40mm x 25mm x 11mm Weight: 10g Voltage detection accuracy: +_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 Features:< /p> Designed for 1-8S Lipo / Li-ion / LiMn / Li-Fe Note: When the voltage is lower than the set value, the buzzer sounds with red LED light, 3.3V preset value. It also has push button control, which can change voltage settings and save them. Contents of the package: 2*lipo battery tester