FrSky D4R-II 2.4G 4CH ACCST Telemetry Receiver Excellent ultralight (only 5.8g), full range, telemetry enabled, 2.4 GHz diversity receiver Supports 4 channel PWM or 8 channel CPPM & RSSI (PWM) Assignable or overrideable Fail-Safe setting with low voltage/reception alarm Supports Naze32/Mullet Baseflight/Cleanflight telemetry with a simple 3 wire hookup! RSSI and BEC voltage telemetry works with zero configuration or special hookup Units sold by ZwissTech are factory flashed with the 27ms firmware for higher reliability with 8-channel CPPM