Spektrum DX4 Pro 4-Channel Transmitter Only | eBay
Spektrum DX4S Four-Channel DSMR Sports System | RC Racer - The home of RC racing on the web
Binding a DX4e - YouTube
DX4R Pro 4-Channel DSMR Racing System | Spektrum
Spektrum DX4 DSMX 4-Channel Full Range Replacement Transmitter Only, Mode 2/4 | Horizon Hobby
Jet school - Spektrum DX4e - REVIEW - YouTube
DX4S 4-Channel DSMR Radio with not one but TWO! SR410 Receivers | Spektrum
HorizonHobby.com How-To: Calibrate the Spektrum DX4 Sticks - YouTube
SpektrumRC - Quick tech tip: If you own a DX4C surface transmitter, A,B,C,D & E buttons can be programmed to do the following; Control the aux1 channel Control the aux2 channel Adjust