Intellect Lipo Battery Power Level Tester & Alarm to Indicate Low Power

Features Work with 3.7V / 1S Pack, 7.4V / 2S pack, or 11.1V / 3S pack. Red LED will flash when cell is below 3.3V. An Alarm will sound when cell is below 3.0V indicating the Lipo Battery pack should be recharged. A great safety tool to have that is highly recommended by experts. A lipoly batter retains maximum life spam when you keep it in great condition, and this little gadget help you do just that!