The Futaba R304SB 2.4GHz T-FHSS 4-Channel Telemetry Enabled Receiver is only compatible with Futaba T-FHSS telemetry compatible transmitters.

NOTE: This receiver is NOT compatible with 2.4GHz FASST, FASSTest, FHSS or S-FHSS non telemetry systems.

Specifications:
Power Requirement: 4.8 - 7.4V battery (dry cells cannot be used)
Receiving Frequency: 2.4GHz
System: T-FHSS (auto detection) with SBUS2 port
Dimensions: 1.38 x 0.91 x 0.33" (35.1 x 23.2 x 8.5mm)
Weight: 0.23oz (6.5g)
Antenna Length: 7-1/2"
Modes: Normal Mode/Analog Servos and High Speed Mode/Digital Servos
Number of Ports: 5
PWM Output: 4
SBUS Ports: 0
SBUS2 Ports: 1
FASST: No
Telemetry: Yes (T-FHSS)
S-FHSS: No
High Speed: Yes
High Voltage: Yes
Connector: J (STND)
Range: Full Range