The (somewhat) new System Sensor i4 series.

They had these on their site for a while, then took them down, and now brought them back online.



http://www.systemsensor.com/products/conv-i4-series

http://www.youtube.com/watch?v=FieQBTEJMmc



They’re available in 2-wire or 4-wire configurations. An i4 interface module is required to make them operate.

I think that these are essentially i3’s with built in carbon monoxide detectors and a slightly different exterior design.

http://www.youtube.com/watch?v=LxD59Ec-w0A Here’s a video from SS at ISC West showing a demo of it. As you can hear, its piezo sounds somewhat like a SpectrAlert Classic’s.