1) Firmware upgradeable
2) One external analog telemetry port and one digital data-stream port (connect to FrSky Sensor Hub FSH-01)
3) RSSI (PWM) and CPPM output - If CH3 and CH4 are connected by a jumper, CH1 will output CPPM for CH1~CH8, and CH2 will output RSSI (PWM)
4) Lighter weight and physically smaller
5) Alarm warning on low voltage, poor reception, etc.
RMRC has custom 3D printed receiver holders & antenna mounts made specifically for the D4R-II HERE.