Product review (5 stars): So easy to use!
Works great and SO Easy to set up (for me).  I am "older" and "technology challenged". Each Remote sender has a toggle switch to set for "1" "2" and "3". Set the switches, put in the batteries, and it works!  I put one on my Basement Crawl space, one in my greenhouse (100 feet away) one out side.
They all work perfect. took me 4 minutes to get working (I had a hard time opening the package of batteries)

Keep in mind, these probably have a host of "features" that i did not care about (like setting the clock.. its a thermometer for Christ sake) and it has alarms, and lots ff things that might be easy to set up, i don't know. I wanted a thermometer, (i already have a clock). if that what you want, you don't have to do anything, just turn it on.