How do I install and mount the e7w Battery Thermostat?

The e7w mounts on standard US single-gang, US double-gang, or UK standard gang junction boxes using the provided Smart Wall Mounting Plate. First, attach the plate to the junction box with supplied screws, then insert four AA alkaline batteries into the device, hook the top tabs into the mounting plate depressions, and rotate the housing toward the wall until it snaps into place. Finally, secure with two captive screws at the bottom. Mount the thermostat about 1.5m (5ft.) above the floor in a location with good air circulation, away from drafts, direct sunlight, and other RF sources. (Page 27-28)