This is a alarm that I put together. Its red with 2 yellow keys. You stick this too your door and then slide the key through, then if someone opens the door with out a key an alarm will go off for 5 seconds. It has a red light and say "KEEP OUT" then an alarm goes off. Its really cool! I made this al by myself, works great! (price maye neg.) #13 with local pickup and $16 for shipping. Please email me for more info or if you would like to buy, thanks!!!