This is the Spektrum DX4e DSMX 4-Channel Full Range Transmitter, Mode 2/4.
- 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 reversing
This is a replacement Mode 2/4 transmitter for RTF aircraft. The mode is changed from 2 to 4 with a switch on the transmitter.