FrSkys XSR 2.4 GHz receiver features 16 ch ACCST, with S-Bus and CPPM.
This little guy is physically smaller and lighter weight than the X4R receiver.
Making it great for mini race quads!

Compatibility:
FrSky X-series Module, X9D, X9DP, X9E, X12S in D16 mode. (XSR does not work with D-series Module)
The LBT version of XSR receiver only works with FrSky D16-LBT Mode.

Features:
Smart Port enabled, realizing two-way full duplex transmission.
S-BUS output. CPPM output.
Lighter weight and physically smaller than X4R.
More number of channels: 1-16 ch from SBUS channel,1-8 ch from CPPM Channel.
FrSky XSR 2.4 GHz 16 CH ACCST Receiver w/ S-Bus & CPPM
FrSky XSR 16 Ch Receiver Specifications:

Dimension: 26x19.2x5 mm (L x W x H)
Antenna Length: 90 mm
Weight: 3.8 g
Operating Voltage Range: 4.0-10 V
Operating Current: 100 mA 5 V
Number of Channels: XSR - 16Ch(1-16ch from SBUS Channel,1-8ch from CPPM Channel)

EU firmware. Går att flasha om via radion.