Lipo Battery Power Level Tester & Alarm to Indicate Low Power Use for 2-3S Lipo/Li-ion/LiMn/LiFe. Two very loud alarm devices beeps and red light is on to warn you when the lipo voltage is lower than the set value. Alarm shuts off when voltage of pack is restored above alarm voltage level. Help prevent damage to your expensive Lipo/Li-ion/LiMn/LiFe battery and prolong it's battery life by never letting the voltage drop too low. Great support device for any Lipo/Li-ion/LiMn/LiFe pack. Dimension: 	40*25*11 mm