There was a bloke near me who thought he knew it all,I put cameras and an alarm on his house and yard in the yard was a very expensive touring caravan,so I wanted a contact on the main gates however he said it was pointless.One day along came a pair of pikey thieves and entered the yard while he was at work,they spent a good half hour cutting the locks off the van before towing it away,all captured in glorious hd colour,now if only he'd listened and had that contact on the gate he'd still have his caravan.The best bit was it took ages for the insurance to pay out as they thought it was a bit iffy as he'd had one pinched some months before,hence the security,it was like fort knox,16 camera's alarm linked to dialler that rang his works and his mobile,yet for the sake of one contact it all fell down.