Turnigy TX Controlled Relay Switch For: X-DART Quadcopter Fast Free Shipping From the USA! Expedited Shipping Options Available! Buy with Confidence! Also Compatible With: Many | Walkera QR X350 | Walkera QR X350 FPV 5.8Ghz | Walkera Devo Controller Compatible Models | DJI Phantom | Walkera G400 | Walkera Master CP | Walkera V450D01 FPV 5.8Ghz | Walkera QR X350 PRO FPV | Walkera QR X800 FPV 5.8Ghz | DJI F550 | Walkera QR X350 PRO | Walkera Devo Receiver Compatible Models | DJI S900 | DJI S1000 | DJI S800 | DJI Phantom 2 | Walkera Tali H500 | Walkera Q... And any other custom application you can dream up!