Function:
1. When testing full power(!#!gt!*!3.6V)2S(7.2V)lipo battery 2 green LEO keeping light;
2. When testing full power(!#!gt!*!3.6V)3S(10.8V)lipo battery 3 green LEO keeping light;
3. When testing full power(!#!gt!*!3.6V)4S(14.4V)lipo battery 4 green LEO keeping light;
4. When boltage !#!lt!*!3.3V，it will buzzer with red LED light;
5. Really usefull in flight if you cant see the lights.

Features:
Test 2S-4S lipo Battery.
Small and portable low voltage alarm， with a very loud buzzer.
Also has a low voltage indicator led panel.

Specifications:
Used for: 2S-4S lipo Battery
Package size: 5 * 3 * 2cm / 2 * 1.2 * 0.8in
Package weight: 8g / 0.3oz

Package list:
1 * Low Voltage Buzzer BB annunciator