When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The best way to identify which alarm it is you need to find its ECU, and printed or embossed on the case will be the model name. Once you have found that, you can then get the necessary manual by one means or another.