help me id this alarm accessory that is missing its cover

[SQ is the SQUAD]

i want to say it a dual primitor shock sensor but i really cant tell. its something i brough like 4 years ago for my hatc but never used. some how i managed to loos the black plastic case it goes in. i am installing my alarm in the morning and i want to know if this is something i can use. here is my high tech drawing. the two little thing on top are diodes and then there are two black boxes

http://img78.imageshack.us/img78/6058/unknownacc4yc.th.png