FrSky R-XSR Ultra Mini Redundancy Receiver You can click Here to buy the originals connection cable altogether. ACCESS protocol firmware: Here OVERVIEW: FrSky ultra mini receiver R-XSR is the evolutions of FrSky full range XSR receiver. The R-XSR is a standalone receiver with all the functions of XSR, in addition, it's almost 1/3 size and 1/3 weight of XSR receiver. Moreover, there redundancy function is integrated into this tiny receiver ensures the security, and the IPEX connector makes it more convenient to replace antennas. The R-XSR is an ACCESS compatible receiver, by flashing the ACCESS firmware it can be re-bound at any time without accessing the F/S button once it is registered to an ACCESS radio. SPECIFICATION (USER MANUAL): Dimension: 16*11*5.4mm (L*W*H) Weight: 1.5g Number of channels: 16CH (1-16CH from SBUS channel, 1~8CH from CPPM channel) Operating Voltage Range: 4~10V Firmware Upgradable Compatibility: FrSky X Series modules and radios in D16 mode FEATURES: Ultra mini size and light weight Support telemetry and Smart Port enabled Full range Switchable SBUS/ CPPM signal output Supports redundancy function IPEX connector, replaceable antennas Package included: 1 x FrSky R-XSR Receiver