Alarms: http://www.akkukauppa.com/radio-ohjattavat/lipo-halyttimet.html
Led alarm is also ok if you can see the leds on your fpv cam
Alarms: http://www.akkukauppa.com/radio-ohjattavat/lipo-halyttimet.html
Led alarm is also ok if you can see the leds on your fpv cam