Features: 36 Melody Wireless Doorbell 36 music tunes for you to choose. Wireless easy mounting design never affects your inner decoration and can be placed at any location. Energy saving and the battery inside the button can last up to for one year(20 presses per day) Ideal for homes,offices,guest rooms,hotels,hospitals and etc.Alternatively,it can be used as a message paging alarm for the patient or babies. Delicate design shows your special taste. Intelligent flash light design brings convenience to the hearing handicapped. Ultra-distance represents the technology of surpassing obstacles. Easy to install, no wire needed. Powered by 2 x AA battery (not included)