"Security Notice - 24 Hour Video & Audio Surveillance Monitored Live" Sign by SmartSign | 18" Aluminum DURABLE ALUMINUM. Signs are made using 80 mil thick aluminum and do not bend easily. They outlast plastic signs, which can be torn off more easily. Signs last up to 10 years outside. LAMINATED. To achieve maximum durability, sign graphics are protected with a laminate. This provides enhanced weather and graffiti resistance. ROUNDED CORNERS. Signs have rounded corners and burr-free corners for safe handling, longer life and a professional appearance. EASY TO INSTALL. Signs have pre-punched and pre-cleared mounting holes for easy installation. Signs mount to U-channel posts, square or round galvanized posts, wooden posts and chain link fences. GIVE A HEADS UP. Convey your Video Surveillance security notice with this sign - before you have to intercede personally.