What it is: 

Fysetc board to simplify AWD or HV conversion by adding 2x 5160 HV capable drivers and a can bus interface with many other connectors available. 

from Fysetc website:

FYSETC StrideMax Dual FD Motherboard Dual Tmc5160 and Car Fuse 60V Max Boards Support Klipper & RRF for Voron VZ 3D Printers About Products: StrideMax Dual FD is a dual-channel TMC5160 control board that supports 48V. It has both CAN/CANFD and USB interfaces. Multiple modules can be used simultaneously with klipper or RRF to meet the high-speed requirements of 3D printers. It also provides additional temperature measurement, fan control, I/O expansion, and RGB light strip support, which is especially suitable as a Supplement to the general control panel

specs:

• Dual TMC5160 up to 10A 
• Dual car Fuse 
• RP2040 MCU，Klipper & RRF Firmware Support 
• CAN / CANFD & USB interface 
• 60V max Power Supply 
• DIN mount case ready 
• Onboard heatsink 
• Onboard Additional temperature sensor for each MOSFET Array 
• 2 x 4Pin controlled Fans，3 x temperature sensor，2 x I/O 
• 1 x Neopixel RGB support