Power: 3 AAA batteries (NOT Included). Outside machine: shape size: 58X86.5X10mm. Installation dimensions: Thickness of the door: 35mm-105mm. Installation thickness of the hole: 35105mm.Operating temperature range: -25centigrade - +55 centigrade. 1 X 806D Door viewer. This could be traced in the post office. Prices and availability of products and services are subject to change without notice. What we sell: Cellphone accessories, security gadgets, computer items and anything else etc. When we work: SundayFriday 10:0022:00 (China Time). Usually we reply the messages within 24 hours. If no reply, please try to resend the message, probably we dont get it. The item "2.8 inch Digital Peephole Viewer Doorbell Door Eye Video Audio Color IR Camera" is in sale since Tuesday, January 19, 2016. This item is in the category "Consumer Electronics\Home Surveillance\Security Cameras". The seller is "businesswithu" and is located in Shenzhen. This item can be shipped worldwide.