FrSky X8R 16-channel ACCST Telemetry Receiver All 16 channels require the FrSky Taranis, or the XJT module. Operating Voltage Range: 4V-10.0V Operating Range: &gt;1.5km (Full Range) Dimension: 46.5mm x 27mm x 14.4mm (1.83" x 1.06" x .56") RSSI output: analog voltage output (0~3.3V)