Wireless Doorbell, 2 Transmitters and 3 Plug-in Receivers No Battery Required for Receiver 58 Ringtones | Coolqiya2021 The Latest Doorbell The unique design with fabric finish, upgraded version it's modified size, it will not occupy other plugs. you can expand 20+ door bells (receivers) & remote door buttons (transmitters). Long Distance Transmission Operates at a highest distance up to 1300ft in open air. Strong Working Signal doorbell for most material door or wall, including glass, metal, wood Multiple Ringtones 58 Ringtones and 5 levels Volume to Adjust; The