WL doorbell / emergency button SmartRoom based on leading technology design, no wiring. When used as a doorbell button, when guests are coming, just press the doorbell button, regardless of where the main person, can receive messages via mobile intelligent terminal; when used as an emergency button, you can carry an emergency alarm is triggered function, and for the first time to send alarm information to the mobile intelligent terminal, the family can receive timely information, and process the first time. This product can be widely used in smart home, smart hotels, intelligent buildings and other places.