With respect to the price, it has been a while since we purchased the Sensaphones, but I think an 1104, which was a unit that would accept up to four sensing devices, was about $200-$250. I think they can be set to trigger on sound and on temperature at that price. They also have a mic, so you can just call them and listen to what is going on...like to detect a noisy motor. We paid a bit more to get remote temperature sensors too, because we were doing two freezers and a refrigerator. The additional sensors (moisture, external temp, etc.) were very reasonable as I recall. If you need a figure closer than that, I will be glad to look it up. One thing I really like about these is how programmable they are. For instance with temperature, I can set it so that a freezer has to be above a certain temperature (say 15 degrees F) for a certain time (say 30 minutes) so that you don't get nuisance calls during the defrost cycle. When it does call, you can set how many different numbers to call, how often to try, and how many total calls it will make. It may sound complicated (like a VCR on steroids!), but the setup is really quite simple. I can see where if you had electric and a phone line in a pump house, you could set it to call you if the temperature dropped below freezing for any period of time you chose. These really work very well, and I promise I have no stock in the company .
