Wireless/Battery Operated Musical Door Chime, With White Cover, Up To 150' Operating Range, Adjustable Volume Control, Mounts Vertically Or Horizontally, Plays 13 Sounds, Different Sounds For Front & Back Door, Add Additional Button, Scrolling Button On Push Button Allows To Change The Tune Of Door Chime, 32 Selectable Codes, Automated Low Battery Alert, Button Uses Two 3V Lithium Batteries Size Cr2032, Included, Chimes Uses 4 "C" Cell Alkaline Batteries, Not Included.