Has Been Replaced By Nutone LA553WHWireless Chime, Portable, Color: White, Dimensions: 6"W x 7 5/8"H x 2 3/4"D, Includes (1) Button. Requires: (4) D Batteries. Has Been Replaced By Nutone LA553WH (Old Chimes Are Not Compatible With New Pushbutton Models and New Chimes Are Not Compatible With Old Pushbutton Models)