Hobby Walkera Devention Devo Radio Transmitter 3 Position Long Switch - FAST FREE SHIPPING Compatible with: Flysky Transmitter , FS i6 Controller ,Spektrum DX6 Suitable for : Walkera X350 Premium | Walkera Runner 250 (R) Advanced GPS Also Compatible with Walkera QR X350 PRO | Walkera Tali H500 | Walkera Runner 250 Racer