Wireless Musical Chime Doorbell, White Battery-powered, wireless doorbell plays your choice of 32 songs from classics like "Swan Lake" to Christmas Carols, as well as traditional chimes The 2 piece set includes an outside doorbell that installs easily without wiring, and a portable receiver that you can use anywhere inside your home Requires 2 "AAA" batteries (not included) and one A23 battery (included) Mounts with 2 screws Doorbell 3 1/2"H