Works pretty good. I have 1 sensor outside and the other 2 in the bedrooms. The bedroom ones are very believable temperature wise as well as the main indoor base sensor. Outside one varies quite a bit from my weather app.
Real problem is with the humidity sensors. Not only is the outdoor humidity far below the actual but somehow according to the unit all 3 of my indoor humidities are higher than the outside humidity, even with the air conditoner on and all windows closed.

Love my new thermometer with 3 remotes, displays for 4 temperatures simultaneously

Great performing product, the 3 trackers are spread out about 50 to 100 feet a part.

I use this in my RV. One sensor is outside one in my "basement" where the water tanks are located and the other is in the living room. (The main unit is normally in the bedroom.) My only issue is that it will occasionally lose connection to one or all of the sensors. Eventually, it will "find" them and reconnect but it is sometimes a lengthy process.

I put in the batteries (I knew they were not included) and watched the sensors all track each other perfectly for a couple of hours before I deployed them to their final location. Display is easily readable from a distance.

My only suggestion is that the base station also run on an AC power adapter, which would then could permanently turn on the back light.

Might also include adhesive preprinted labels "1", "2", and "3" to stick on the remote sensors so you don't forget which one is set to which channel.

Do check the channel setting switch when you put in the batteries; 2 of my sensors were set to the same channel number so I had to change one of them.