JR RG631B is a 6-Channel Full Range 2.4GHz DMSS Receiver with telemetry functions. The included RA-01L is both a remote antenna and telemetry module.

Specifications:
Dual Coaxial Antenna
Remote Antenna (RA01L)
Short range telemetry Module (Incorporated in remote antenna)
Operating Voltage : 4.5V-8.5V
Dimensions 12.5×20×46.5mm
Weight 9g
Antenna : Coaxial potion / 120mm : Antenna potion / 30mm