Yeah, I missed out on that. I have the Radio Shack wireless Thermometer / Hygrometer. With a couple of sensors. They work really good for letting you see the RH in your humidor without opening them. I have a total of about 6 humidors plus 2 igloodors. I wind up moving the sensors around about once a week. Wish I could have picked up two more recievers and7 extra sensors. Each reciever can handle three sensors. That would have covered me for 9 humidors. Oh well.