SmartSign 3M Diamond Grade Reflective Aluminum Sign, Legend "Protected by Electronic Alarm System", 12" square, Black/Red on White Legend "PROTECTED BY ELECTRONIC ALARM SYSTEM" Lyle signs supplies your sign with radius corners for safety; holes punched for post mounting Lyle Ultimate signs have a 12 year durability Lyle Signs produces signs that exceed industry standards and specifications The temperature range is -40 to 175 degrees F