starfighter81 This is a flight controller and has no receiver build in! You can use any receiver that outputs S.BUS, PPM (also reffered to as CPPM), ELRS and crossfire.

starfighter81 It comes preflashed with marlin but you need to adjust and flash the firmware to match your printer. Steps per mm, thermistors, endstops, temperatures etc. are all different for every printer! You could adjust most parameters using the display and g-code commands, but in many cases you will need to customize (and compile) the firmware to suit your hardware. Luckily the are ready made firmwares for lots of printers out there. And if not, just ask for help in the great 3d-printing-community on social media and forums.

starfighter81 There is no reliable way to tell even if they were marked. You need to connect the motor and check. If it runs the wrong direction you simply flip two wires around.

starfighter81 Itis coated with clear protective silicone.

starfighter81 The board can be configured to use TMC drivers in normal step, SPI or UART mode simply by setting the jumpers.

starfighter81 We ordered 3: 2 are white and 1 red. So it is kind of random. I think the white version received some minor updates though, but not 100% sure.