My XYL is pushing me into getting some of the wireless smoke detectors that Kidde sell. They interconnect wirelessly so that if one alarm goes off, all the others set to the same code also go off. This is great for places such as mine that are multi-storied. According to the tech support guys at Kidde they operate at a frequency of 434.3 MHz, well outside of any ham bands (except 440, which I don't use).
What I am worried about is having them go off when I power up the amp on HF..... Anybody had any experience with these particular units? They claim to be FCC Part 15 type accepted, but we all know that does not mean much.....