DX3S 3-Channel DSM Surface Radio with Telemetry comes with 2 standard servo's. Key Features Integrated telemetry with graphically depicted gauges on transmitter. Check your Head Temp, RPM's or Roll-Out for mph and receiver Battery Voltage. Just a programming change. Comes with 3 Telemetry probes and the following features: 10-model memory Includes free bonus SR300 3-channel DSM sport receiver and Telemetry receiver, two receivers in all! Now compatible with the MR3000 3-channel marine receiver and DSM2 surface receivers, in addition to DSM surface receivers. Monitor your engine or motor’s operating temperature in either Fahrenheit or Celsius Never let a low battery stop you in your tracks – the DX3S and integrated telemetry let you watch over your receiver pack’s voltage to keep you in the running Keep tabs on your engine’s operating range-safe high-rev operation Rolling selector user interface for fast, easy programming and setup 10-character model naming 3 grip sizes (small, medium, large) Adjustable Frame Rate: 11 or 16.5ms ModelMatch Expert and standard modes Digital trims Throttle Punch Steering dual rate Travel adjust Sub trims Servo reverse Exponential 3-timer functions Aux/Steering channel mixing Telemetry alerts Buzzer adjustments - high, low and off Screen contrast Transmitter battery alert Right-hand configuration (only) Overview Combining Spektrum’s industry-leading 2.4GHz DSM® technology with valuable telemetry features, the DX3S represents the most advanced sport-level DSM radio ever developed. RTR drivers and sport racers can add the safety of telemetry and monitor vital vehicle stats right from their transmitter, without any additional equipment. Keep your engine operating in the optimum temperature range, keep an eye on your battery voltage and check out just how fast your vehicle is running, all right from the large LCD readout of the DX3S. The DX3S is now compatible with the MR3000 and DSM2 surface receivers too. The typical telemetry range is 100–200 feet and will vary depending on the operating environment.