Ultra Mini Only 1.6g!!!Specification:Dimension:21.5x12x3.5mm(LxWxH)Weight: 1.6gNumber of Channels:Up to 16CH from SBUS(CH1~CH15 for PWM, CH16 RSSI for FC)Operating Voltage Range:3.7~10VOperating Current:30mA@5VOperating Range:FULL rangeWith RSSI output on board:Analog 0~3.3VFirmware UpgradeableCompatibility:FrSky D16 mode