A split 75% staggered keyboard made and sold by Keebio. More info at Keebio.
Make example for this keyboard (after setting up your build environment):
make keebio/sinc/rev1:default
Example of flashing this keyboard:
make keebio/sinc/rev1:default:flash
Handedness detection is already hardwired onto the PCB, so no need to deal with EE_HANDS or flashing .eep files.
See build environment setup then the make instructions for more information.
A build guide for this keyboard can be found here: Keebio Build Guides