Got an alarm what you think

[Sho_tyme_psi]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=017&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=270097960281&rd=1,1

Ok, so its a cheapy. but has a motion sensor and all I really want is the door open alarm, also hooking to hood. Luckly i get to park next to my apt. Hope it will help out when I put a stero in, but most woried about my inovative WB. It suck we even have to buy these do to damn theives.