• CONVENIENT ONE WAY VIEWING LENS: This mechanical doorbell chime sports a subtle spring activated slider that allows you to peek outside through the viewer, which has a one way, 180-degree angle lens.
• SUPER EASY TO SET UP AND MAINTAIN: Absolutely maintenance-free, with no wiring or batteries required for the door bell chime to work. May be used as a doorbell chime replacement if needed.
• MOUNTING AND FASTENING HARDWARE INCLUDED: Purchase of this door bell mechanical design includes screws that are meant to be used with wood doors only.
• ITEM SPECIFICATIONS: The outer metal face plate of the door bell measures 5 inches in height and 2 inches in width. The chime measures 3.5 inches in length, 1 5/8 inches in width, and 7 inches in height.
• IMPORTANT TO NOTE: When printing the instruction manual of the door bell, please make sure that the print settings are in “Actual Size” and not “Fit”, so that the mounting template scale comes out correctly.

Instruction Manual