A conjoined-split 40% ortholinear keyboard made and sold by Montsinger. More info on Montsinger.net.
Make example for this keyboard (after setting up your build environment):
make montsinger/rebound/rev1:default # for rev1
make montsinger/rebound/rev2:default # for rev2
make montsinger/rebound/rev3:default # for rev3
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide