ITEM NAME:2S-3S RC Lipo Battery Low Voltage Tester Checker Alarm Indicator Buzzer LED ME 100% brand new and high quality 2-3S RC Lipo battery low voltage buzzer alarm When battery voltage is heigher than 4.3V, LED indicator light turns to red, flashing slowly and buzzing When battery voltage is between 3.0-4.3V, LED indicator light keeps green, not buzzing. When battery voltage is lower than 3.0-4.3V, LED indicator light turns to red, flashing quickly and buzzing It can prevent your Li-Po battery damaged due to low voltage It is also a good device for quick test for your lipo before flight, and it can use as inflight alarm if you not sure the maximum flight time. Fits for:2-3S Lipo battery Size: 32*18*9mm/1.26*0.71*0.35" Quantity:1PC Note: 1.Please allow 0-2cm difference due to manual measurement。 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you for your understanding, nice day! Package includes:.Fits for:2-3S Lipo battery.