Low voltage buzzer for Lipo battery (Really Loud!!!)
Really usefull in flight, even if you can't see the lights.

• When testing full power (> 3.6V) 2S (7.4V) LiPo battery: 2 green LED keeping light.
• When testing full power (> 3.6V) 3S (10.8V) LiPo battery: 3 green LED keeping light.
• When testing full power (> 3.6V) 4S (14.4)  LiPo battery: 4 green LED keeping light.
• When voltage < 3.3V, buzzer will sound with red LED light

Weight: 6.5 gr / 0.23 oz
Size: 34 x 25 x 11 mm.