Saw this in the paper the other day! No idea how it works but the ad says

"Block Your Parking - Parking lock with remote control. Heavy motor with rechargeable battery. Security-Safety Trading Center, Near to Jaidah Flyover, B-Ring Road, Call 4427171, 5553401"  

I found a picture on the web for you but the link is so long it messes up my post...

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Be kinder than necessary, for everyone you meet is fighting some kind of battle.