This is the Futaba R304SBE 2.4GHz T-FHSS S.BUS2 4-channel Telemetry Receiver.

FEATURES: Only for use with electric powered RC vehicles, do not use with
glow or gasoline powered vehicles
Telemetry data can be displayed and checked at the transmitter
by connecting the telemetry sensor to the S.BUS 2 port of this
Built-in antenna
Normal and high-speed mode, normal accepts any type of servos* or the
peripheral, high speed mode accepts digital servos, including BLS
series and most peripheral equipment such as brushless ESC's
One year limited warranty through Hobby Services beginning at date
of purchase

INCLUDES: Futaba R304SBE 2.4GHz T-FHSS S.BUS2 4-ch Telemetry Receiver with

REQUIRES: Digital servos of modeler's choice

SPECS: System: T-FHSS system at Normal/High speed mode (auto detection)
Receiving Range: 230' (70m) under best conditions
Power Requirement Rated Voltage: 4.8-7.4V
Usable Voltage: 3.5-8.4V
Size: 1.38 x 0.91 x 0.33" (35.1 x 23.2 x 12.5mm)
Weight: 0.23oz (6.7g)
F/S and Battery F/S Function: Sets according to transmitter used
Battery F/S Voltage: Arbitrarily set with transmitter

COMMENTS: Not compatible with the Futaba S-FHSS, FHSS, FASSTest or FASST
*For best results do not used analog servos with this receiver.
Ref. n: FU503