FrSky's F3 Evo flight controller has a native built-in F3E and XSR receiver module that will allow you to bind your Frsky transmitter to the F3 board without having to have an external receiver, this means it is great for small FPV racing quad builds as it features the latest Accelerometer, Gyro and Compass and Baro sensor technology.
The XSR receiver is a full duplex telemetry receiver meaning it will receive the commands of radio and send them to F3E by SBUS (8CH is RSSI) to UART2 Rx of F3E. It can also send telemetry information back to radio by smart port. After configuration, you can use the FrSky X9D/X9D-Plus/X9E radio (wireless) to set the PID parameters for XSRF3E. The board also features 6 PWM output signal lines for ESCs and Servos. Arranged for easy wiring on standard pin headers.