cyclone K0805-144 version comes with RX144 - DSMX-DSM2 receiver (not available at the moment, I believe).

cyclone Yes, you can switch the modes. You need to press one of the buttons when you turn on the transmitter. See instruction manual.

cyclone No, both motors are brushed motors.

cyclone You can download schematics here github.com\mcauser\MCUDEV_DEVEBOX_H7XX_M\blob\master\docs\STM32H7XX_M_schematics.pdf (This website doesn't allow to post direct links with slash symbols, so if this link doesn't work just try to Google MCUDEV_DEVEBOX_H7XX_M)

cyclone Mounting hole pattern is triangle with the side of about 21 mm. Mounting holes are about 3 mm diameter (M3 screw fits it perfectly).

cyclone USB-C connector means they used newer microcontroller. If so, it should be faster and probably has more memory (ROM, RAM) and probably slightly lower power consumption - longer battery life. It looks like copy of Carbon version rumored with carry case absence (that's why lower price). Revived successful small radio with DeviationTX firmware (as jumper.xyz lastly has switched to OpenTX).