XBus compatible Diversity 8channel DMSS receiver w/Hybrid output port availableSelectable Xbus/PWM port output on AUX3Easy BIND system (No binding plug is needed) 
DMSS 2.4GHz 8ch Add Receiver "RG812BX-B"
Use with RG812BX (R8A)(1ch to 8ch) you will be able to use 16ch
Dimensions : 14.5 x 25.5 x 47.5mm
Weight : 15g
Receiving System : 8 channel DMSS System with XBus
PWM Output ch : 9ch - 16ch
Operating Voltage : 4.5-8.5V
Bidirectional communication : Xbus compatible
No Telemetry 
Antenna Diversity Model
Capabel to adopt one additonal remote antenna as an option.
Fullrange receiver
Full range telemetry capability.
Remark:  
the transmitter needs to be Xbus A mode to operate the receiver.