Thanks as well. I decided to go with this alarm, http://www.ebay.com/itm/like/252094388277?dest=http%3A%2F%2Fwww.ebay.com%2Fitm%2F252094388277, probably more than I needed to pay, but I liked the idea of a strobe alarm.

@sundberg84 Thanks for the info. Any reason for the switch?

@sundberg84 What did hoh use to set up your siren? I'm working on my own home security project as well.

Has anyone checked out RFduino yet or tried incorporating it into their my sensors project? Seems like a great way to avoid having to connect a nano/micro to the transceiver and is much more compact.

http://www.rfduino.com/product/rfd22102-rfduino-dip/index.html