Newhouse Hardware MC145B Wireless Mechanical Two-Note Chime and Door Button with Built-in Viewer, Bronze

Maintenance Free, No Wiring or Batteries needed, One Way 180 Degree Wide Angle Viewing Lens. The doorbell chime has a spring activated slider to see through the viewer. Mounting and Fastening Hardware Includes Screws for Wood Doors only. Please note: When printing the instruction manual on this item page, please make sure that it is printed in Actual Size and not Fit so that the mounting template scale is correct. Please note: this door chime works best for smaller homes, apartments, studios, or offices. It may be difficult to hear this chime from further than 30 feet away