Super-It Wireless Remote Control Door Calling Bell (Color and Design May Vary) Remote control doorbell long operating range reach over 100 meters. Such Remote Control Doorbell is easy to install, with double-side stickers at the back of the remote button. So Wireless Doorbell doesn't affect the decoration. Specifications for Home and Office use pleasant sound and bell options intelligent flash light (an aid to the hearing handicapped) easy mount design battery provided-lasts 1 year if bell is pressed 20 times a day. Suitable for building, hospitals, clinics, offices, homes, factory and so on. 6 months Warranty.