Check the listing for details. FrSky R-XSR Ultra Mini Redundancy Receiver (RXSR Receiver). Condition: New. Listed at 24.99 USD. FrSky ultra mini receiver R-XSR is the evolution 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.SpecificationsDimension:16*11*5.4mm(L*W*H)Weight:1.5gNumber of channels: 16CH (1-16CH from SBUS channel, 1~8CH from CPPM channel)Operating Voltage Range:3.0V~10VOperating Current:70mA@5VFirmware UpgradableCompatibility: FrSky X Series modules and radios in D16 modeFeature:Ultra mini size and light weightSupport telemetry and Smart Port enabledFull rangeSwitchable SBUS/ CPPM signal outputSupports redundancy functionIPEX connector, replaceable antennas