• Outside Faceplate: 4-3/8" Tall X 3" Wide

• Inside Size: 6-1/4" Tall X 3" Wide

• Material: Brass And Steel

• For 1-3/8" To 1-3/4" Thick Doors

• 180 Degree Viewing Angle

• Used To Allow A User To Identify Visitors From The Security Of A Locked Door

• Two Note Mechanical Audible Door Chime

• No Wiring, Batteries Or Electricity Needed

WARNING: This product can expose you to chemicals including diethylhexyl phthalate (DEHP) which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.