This is the HobbyZone Aerial Drop Module: FC2, Slo-V, FBF, ABX, ABS, SC

Overview:
Plug in the Aerial Drop Module and you can drop streamer bombs or a parachute, all of which are included. The Aerial Drop Module is compatible with any X-Port equipped HobbyZone airplane, like the Firebird Commander, Aerobird Challenger, and Aerobird Xtreme. It also works with the ParkZone Slo-V.