Shelly Accessories / Combinable Wall-/ DIN-Rail Mount for Shelly Dimmer 0/1-10V PM Gen3 Version: Wall and DIN-rail mount brackets, with screw holes on the back, for mounting one Shelly Wi-Fi relay on the wall or (in the wall and DIN-rail mount version) on a 35mm DIN rail (DIN-Rail) in the electrical distribution box.