This is the Spektrum SR3300T DSM 3-Channel Surface Receiver.  The SR3300T is compatible with all standard DSM Spektrum surface transmitters (does not work with DSM2 radios).  Spektrum’s SR3300T 3-channel DSM receiver features integrated telemetry that is compatible using Spektrum’s handheld telemetry unit (not included) or telemetry can be displayed on screen using the Spektrum telemetry-compatible transmitters. Telemetry features include voltage, temperature, rpm and laps (handheld only).

Features:

• 3-Channel DSM surface receiver with built-in telemetry
• Telemetry features include voltage, temperature, rpm and laps (handheld only)

Specifcations:
Type: DSM with Integrated Telemetry
# of Channels: 3
Modulation: 2.4 GHz
Dimensions (WxLxH): 1.06 x 1.60 x .58 in (27 x 41 x 15mm)
Weight: .4 oz (11 g)
Voltage Range: 3.2-9.6V

Note: The SR3300T receiver does not include the telemetry sensors or rpm sensor mount hardware. Sensors and mount hardware are available separately.