Product Review

D4R-II is a full featured mini sized 4 channel receiver, The D4R-II's data port allows you to connect a sensor hub so you can connect GPS, Variometer, temperature, RPM and all of the other great FrSky sensors. if the jumper is used on CH3&CH4 it does output a 8 channel PPM stream plus a RSSI voltage signal on channel 2. Perfect for FPV.

Model Name:D4R-II
Compatibility: Compatible with FrSky two way telemetry modules: DFT, DJT, DHT, DHT-U
Specifications:
Dimension: 40*22.5*6mm
Weight: 5.8g / 5g (naked)
Operating Voltage Range: 3.5V-10.0V
Operating Current: 60mA
Operating Range: Full Range (>1.5km) Resolution: 3072 (>11bit)
Features: 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 than D8R-II plus & D6FR;
5) Alarm warning on low voltage, poor reception, etc.