Premises Are Under 24 Hour Video Surveillance Let the bad guys Know you are watching deter crime before it happens! They will see the signs and hopefully move on. Premises Are Under 24 Hour Video Surveillance. The large text and dynamic, yet simple design are sure to grab attention. Signs read: WARNING THESE PREMISES ARE UNDER 24 HOUR VIDEO SURVEILLANCE. Made of durable propylene. Each sign measures 12" x 8-1/2". Comes As 1Pc.Made Of Durable Thick Polypropylene Measures 12" X 8-1/2".