Product features.Number of serial ports: 2+1 (soft serial port) 1. PCB adopts high-end 8-layer 2Oz thickened copper skin, stronger over-current capability and good heat dissipation. 2. MOS using imported 30V high current MOS, long life with strong load capacity. 3. Using industrial grade LDO, high temperature resistance. 4. Using high-quality Japanese Murata capacitors, strong filtering performance Flight control parameters: MODEL: A-2-4S 20A AIO / B-2-6S 40A AIO CPU: STM32F411CEU6 IMU: 1CM42688 OSD: AT7456E Barometer: Integrated Black box: 16M BEC: 5V/3A LED: Adjustable LED light Sensor: Built-in current sensor Firmware version: HAKRCF411D Receiver: ELRS / Frsky /Fu taba / Flysky / tbs CRSF / ds mx DS M2 receiver NOTE: Factory slightly different Material: PC+metal colour: blue<br><br>Package Contents: 1 x Flight Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.