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The EA-020 has both navigation lights, spotlight and a built in LiPo battery alarm. 

The LED strobes will flash in sequence when the battery voltage is higher than the pre-set voltage (navigation lights). Then the LED will  stay on with a 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 desired 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 Both 2 and 3 cell connectors are included.
• Includes Red, Green, Yellow navigation LEDs and a White head LED.

There are many benefits of using a Li-Po Alarm:

• It helps to prevent the over discharge of  Li-Po batteries.
• It tells you when to land your plane before the speed controller gives you a cut off.
• And, with the EA-020 you have nice navigation light signals for that realistic scale look .