Hybrid Wired Or Wireless Door Chime Combined Into One Unit. Works For New Construction, Replacing A Doorbell, Or Adding A Doorbell to An Existing Home. Features Volume Control, Front Or Back Door Selectable, and 10 Quality Sounds. 5 Chime Choices Including: Big Ben 8 Note Westminster, Big Ben 2 Note, Traditional 8 Note, Traditional 2 Note, and Traditional 1 Note. 5 Musical Tunes Including: Merry Christmas, Auld Lang Syne, Birthday Song, Us Anthem, and Beethoven 5Th. When Installing In Wireless Mode There Is No Wiring Required and Up to 300 Foot Operating Range. 10 Inches Wide X 8.5 Inches High X 2 Inches Deep. Weighs 2.5 Pounds. 5 Year Warranty.