Heath Zenith Wireless Molded Door Chime SL-7751 Sl-6151 Wireless Door Chime Kit Includes 1 Plug-In Receiver & 1 Battery Operated Push Button (Push Button Battery Included) Up To 75-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 75-Feet Transmission Range 2 Note Melody for Front Entrance and 1 Note for Rear Entrance