Heath Zenith Wireless Door Chime with White Cover SL-6140 Sl-6140 Wireless Door Chime Kit Includes 1 Battery Operated Receiver & 1 Battery Operated Push Button (Push Button Battery Included) Up To 100-Ft Transmission Range 2 Note Melody For Front Entrance & 1 Note For Rear Entrance White Molded Cover 1 Year Warranty White Molded Cover Up to 100-Feet Transmission Range 2 Note Melody for Front Entrance and 1 Note for Rear Entrance