FrySky's Satellite full range micro receiver.
This is the XM+. Teeny tiny and weighs just 1.5 grams. It is an excellent choice for use as a satellite receiver for the RX8R.
The XM+ also make a great full range micro receiver for mini quads and can be soldered into your flight controllers wiring harness or you can solder on the included header pins so that you can connect to your flight controller using standard JR style servo plugs. Firmware can be upgraded.
Note: The XM and the XM+ receivers do not send back telemetry.
Note: These receivers now ship with ACCST V 2.x flashed! You will need to either back-flash it or update your transmitter for V2 compatibility.