The LED strobes will flash in sequence when the battery voltage is higher than the pre-set voltage (navigation lights). Then the LED  will become steady light when the battery voltage drops below the pre-set level (battery alarm). A built in tuning trim that allow the users to choose their desire cut off voltage (3.0v to 4.0v per cell). 

• This battery alarm is suitable to use with 7.4v and 11.1v lipo batteries.
• Includes Red, Green, Yellow netvigation LED and White head LED.

• It helps to prevent the over discharge the Li-Po battery.
• It tells you when to land your heli/plane before the speed controller cuts off.
• Fly in the dark with the navigation lights