FEATURES : USB on right side PPM/PWM input as through-hole Flexible motor outputs, support various airframe types: Quad/Hexa/Tri/Bi/Y4/Y6/Octo/Camera Gimbal. (Default is Quad-X) Up to 8 ch RC input - supports standard receivers (PWM), PPM Sum receiver (FrSky, etc), or Spektrum satellite receivers. Built in FrSky telemetry inverter Battery voltage monitoring Modern 32-bit processor running at 3.3V/72MHz (STM32F103CB). 3.3V, I2C on standard-size headers SBUS Inverter built in Spectrum satellite MPU6500 Sonar pads w/resistors added for direct connection to 5V sonar BMP280 barometer