SPM4000 Spektrum DX4S 4-Channel DSMR Radio System. Whether you are a basher, boater, rock crawler or racer, the Spektrum™ DX4S 4-channel sport radio system offers an impressive list of features that make setup and driving a lot more fun.
 It's great for marine applications too. The frequency-agile, Spektrum DSMR technology it's built around delivers outstanding range and response in all types of environments, especially those where a lot of 2.4GHz systems are in use at once. DSMR transmitters are compatible with DSMR, DSM2, DSM and Marine receivers.

 - Backlit LCD
 - 30 Model memory
 - 3 Grip sizes
 - Integrated Telemetry (requires a DSM® telemetry compatible receiver)
 - 2 User-defined, programmable mixes
 - Pre-set mixes, including 4-wheel steering
 - Switch-activated mix rates
 - ABS
 - Vibe alerts
 - SD card reader
 - On-the-fly mix rate control
 - Integrated antenna
 - Inactivity alarm

 Included:

Transmitter
SR410 DSMR 4-Channel Receiver
3 Grip Sizes
Switch Harness
Sticker Sheet
Instruction Manual
Bind Plug
4 AA Batteries