Futaba R304SB 4ch Rx with Telemetry T-FHSS (S-Bus) (HV) 2.4GHz - P-R304SBThe R304SB is a compact little 4 channel receiver using T FHSS telemetry. Suitable for HV applications the R304SB has an operating voltage range of 3. 6 up to 8. 4v. T FHSS is a variation of Futaba's FHSS technology with the added bonus of telemetry. As standard the receiver will monitor its own voltage and transmit that back to your T FHSS transmitter. There is also a S. Bus2 port included allowing you to plug in additional futaba telemetry sensors.