The special and pleasant sound of the doorbell has several bel cantos for all people to choose. Delicate streamlined appearance shows the special tastes of the host. Up-date intelligent flash light design brings convenience to the hearing handicapped. Ultra-distance represents the technology of surpassing anstacles. Wirelessly eay mounting design never affects your innter decoration and makes the doorbell anywhere you like. All day long anti-interference system, pretends the doorbell from unterference outside or between neighbors, Energe saving design of environment protection. Delicate smart part, makes the doorbell a saluting angel of dwelling house, working building, hotel, etc. Battery included.