i believe that it is plugged into a channel then the servo into that plug. mine is plugged onto my aileron channel. because mine is like when the channel isnt used for more then a minuet or so the alarm goes off, so i figured if i crash the aileron wont be moving and when i had it hooked up to my throttle channel it would go off all the time because im not allways moving the throttle controls....hope this helps...