R9 (Range 9 ) is FrSky new generation 900MHz long range receiver. It MUST work with R9M module.

Specifications
Dimension:43.3x26.8x13.9mm (L*W*H)
Weight:15.8g
Operating Voltage Range: DC 3.5V-10V
Operating Current:100mA@5V
Operating Rang:Up to 10km or above
Firmware Upgradable
Compatibility: R9M
Number of Channels:
R9 EU Version Non-EU Version
R9M Mode Telemetry NO-telemetry Telemetry
Channel Number 8/8CH 8/16CH 8/16CH

Features
900MHz/868MHz working mode
Longer range than L9R
Low latency and high precision
Support redundancy function
Smart Port enabled and support telemetry data transmission
Battery voltage detection
With RSSI PWM output (marked by P4 on board)