Race Guard Micro Fail-Safe  

Race Guard Micro Fail-Safe Key Features Compact size: .75 x .5 x .27in Light weight: .13oz (3.9g) Operating voltage: 4.0V - 6.0V Overview The programmable fail-safe unit is designed to return your throttle to a preset brake position in the event of a signal loss to your receiver or when the receiver's input drops below 4.0 volts