I like it quite a bit for about $50.00. It comes with 1 temp/humid sensor but I purchased 3 additional, 4 in all. We have a 3 story house with 1 on the roof deck, 1 on the top floor, IN on the second floor with the readout, 1 on the ground floor and one outside 30 feet from the house. They're all received fine.
I had a bit of trouble with the unit locking in on the signal but after 4 tries all the temps and humidity are displayed. It also took some time to adjust and correct the temperatures & humidity readings but it's working fine now.
I set up the color parameters to reflect the outside ground level as the wife has some exotic palms. The changing colors are very cool, especially when you wake up at 3AM, walk by it and tell the temperature from just the color.
Don't know how long it will last but it works great and was not expensive. A good purchase.