Outdoor wireless siren

I am looking for an outdoor wireless siren which looks like it has to be a zwave device. Do you have any suggestions for that?

You can do an outdoor wireless siren with this although I haven’t used one.

http://www.fortrezz.com/index.php/products/siren/itemlist/category/18-siren-strobe-alarm-wire-wireless

We don’t currently carry it and it still says not to expose it to the elements such as rain.

The other (probably better) way to do it is to use a z-wave appliance module and a 12VDC power supply with a wired siren. Plug the appliance module into an indoor receptacle near the location you want the outdoor siren. Plug the 12V power supply into the appliance module and run a short wire from there to the outdoor siren. Then you can program a rule that turns on the appliance module when an alarm occurs.

http://suretydiy.com/product/2gig-plug-in-light-onoff-switch