By M_RSH12/08/2018The smallest of the FrSky X-Series receivers. Has full telemetry and is F.Port compatible. Inverted S.Port and S.Bus solder-pads are available but really small.
The pictures show size comparison between R-XSR, XM+ and XSR-E (XSR-M) receivers.
By AlphaTango13/04/2018Smaller than everything on the market and with full telemetry via smartport. The best.