FrSky X4RSB 3/16ch 2.4Ghz ACCST Receiver (w/telemetry) Features: • RSSI (PWM) output • Lighter weight and physically smaller than D8R-II & D6FR • Two selectable failsafe setting options - native failsafe or user programmable failsafe • External analog telemetry port (AD2) • SB port is compatible with Futaba S.BUS servos and FrSky SBUS&CPPM compatible servos Specs: Number of Channels: 3ch - Conventional Channels, 16ch with SBUS Operating Voltage Range: 4V~10V Operating Current: 100mA Operating Range: Full Range (>1.5km) Dimension: 40x22.5x6mm Weight: 5.8g Compatibility: FrSky X-series modual (XJT, etc) & Taranis X9D in D16 Mode) *Note: Does not work with D-series module.