DX4e DSMX 4-Channel Full Range Tx only MD1/3 This is the Spektrum DX4e DSMX 4-Channel Full Range Transmitter, Mode 1/3.Features:Fully-proportional aileron, throttle, elevator and rudder channels HI/LO rates JR and Spektrum compatible trainer system Full-range DSM2/DSMX 2.4GHz technology Delta wing mixing Servo reversingNote: This is a replacement Mode 1/3 transmitter for RTF aircraft. The mode is changed from 1 to 3 with a switch on the transmitter.