DIDN'T HEAR THE DOORBELL? YOU WILL WITH THIS WIRELESS DOOR CHIME! Installs anywhere: basement, laundry, garage; so you won't miss a visitor. Set includes: • 1 outdoor bell unit (5 1/4 x 2) • 2 portable indoor receivers (ea. 3 1/2 x 2 3/4) Bell unit mounts easily at front door with self stick tape or screws (both incl.); receivers plug into standard wall outlets and have up to 50 ft. range. Bell unit uses one 9V battery (not incl.). UL listed.