Airguard Fail-Safe protects glow and gas aircraft against “flyaways” caused by lost signal, interference or low receiver battery voltage. The programmable Airguard™ Fail-Safe is designed to return the throttle servo to a preset position in the event of a signal loss to the receiver or when the receiver's input voltage drops below 4V. Connects easily between the receiver and throttle servo. Also monitors status using the easy-to-read LED, which displays three different colors. Weight: 0.25 oz. (6.35g)