This is one of the best F4 flight controllers on the market in my opinion. These have been reliable and fairly cheap all in one solution for me as a beginner. Also this is the original board that the JBF4 was based off of. The nice thing about this board is the layout for ease of use for soldering all your components in a clean looking environment. CLRACING_F4S_AIKON_2Download As you can see the ESC wires are clearly marked for individual ESC use. There is a connector for use with a 4in1 ESC as well. If you are going to use the 4in1 ESC you will want to look at the pinout connection before connecting your ESC to it to ensure the proper pins are connected properly. Board orientation is the flag on the CLRacing logo, it’s pointing up so that is the front and you can see the solder pads for CAM, CAM CONTROL, CAM POWER, SAT for ESC Telemetry, SBUS for FrSky which can also be used for CRSF (TBS Crossfire) as an RX the the back of the board has TX1 for the other port for crossfire. Alternatively you can also use the TX4 and RX 4 pads for CRSF however i usually use that for TBS SmartAudio protocol.