This is the Airtronics RX-472 2.4GHz 4-Channel FH4T Super Response Receiver, with Sanwa Synchronized Link (SSL) Support.
This is the Sanwa RX-471 2.4GHz FHSS-4 Surface Receiver
This is the Sanwa RX-481 2.4Ghz FHSS-4 4-Channel Surface Receiver,
This is the Sanwa RX-482 2.4GHz 4-Channel FHSS-4 SSL Telemetry Receiver features a built-in antenna
The Sanwa RX-462 2.4GHz FHSS-4T 4-Channel Telemetry Receiver
RX-451R receiver for M11X and MX-3X, Super High Response receiver featuring ultra fast 2.4GHz F.H.S.S. technology.