I've had these running for over 3 months now with no issues. Remote sensor distance over 75 ft. with original batteries. Have tested these with my other temperature sensors and they closely match them... +/-1 to 2 degrees off.
As far as humidity I'm unable to test that though between 3 remote sensors and base in same location right next to each other I get readings of about +/-3 off from each other.
The base station is simple to operate and has a backlight feature, but the manufacturer should have thought that out better ~ cuz at night you really can't see the light bulb icon to tap it for it to light up. Should have made the whole display screen touch sensitive or the surrounding bezel touch sensitive for it to light up the display screen.

What I would like to see in their next version // is basically keep it the same just make the backlight display easier to access in dark situations, also make the channel number font larger and for the Channel Auto rotations of the remote sensors. Bypass that channel display, no use for it to display that channel when you have no sensor for it, the one that is not in use, so the display doesn't show anything for that channel instead of waiting for it to go through its cycle.
There's a lot of electronic components in here for the low price you pay on these two units for temp and humidity including remote temp and humidity. It's a bargain. Check out my pictures..

This is my fourth attempt at buying a reliable wireless thermometer in the last six months. The other three, sold by the competition, all quit working within the first few weeks. After receiving my new Thermpro, I was very pleasantly surprised to receive an email from a customer service rep who wrote to inquire if I was happy with my purchase or needed any help with set up, etc. What a refreshing change!
I've only had this thing for about a week but so far so good. I'd give it five stars but I was disappointed with how one is expected to mount the remote transmitter. It's just a simple slot for hanging the unit on a nail or screw with no mounting hardware included. I had to hunt around for the proper size screw then tweak it just so in order to get the transmitter somewhat secured to my deck. Given that this thing is supposed to be placed outside, I'm surprised that it is designed to be hung on a nail like some cheap picture frame. I'm concerned that without a more secure mounting system, the unit could be blown off its nail/screw head and be damaged or destroyed. All the other models I've owned have had a separate bracket to screw in place then snap the transmitter securely into the mounting bracket. Time will tell. Seems like a great company to business with though!

If you want easy-to-read indoor/outdoor temperature and humidity, and don't need another clock, this is a very nice choice. The digits are large enough to read from across the room. The channel number, however, is small. If you use multiple remotes, you'll need to be close to see which one is being displayed. Controls are touch-screen, operated by tapping on icons rather than physical buttons. There's a manually-operated backlight if you want to read the screen in the dark. You won't be able to see the icon that tells you where to touch to turn the light on unless it's light enough that you don't need it, but it's easy to memorize the position.

The base station has a typical mechanism, oddly called "all time," for viewing and resetting the maximum and minimum temperatures. It has another function, called "24 hour," that assumes you don't reset manually. The manual describes it incorrectly, but I experimented with it and found it works like this. Suppose you reset the maximum and minimum manually at, say, 11 AM. Then from that point until 11 AM the next day, the 24-hour function reports the maximum and minimum since the reset, exactly as the "all time" function does. Then, assuming you never reset manually again, the 24-hour function will reset itself automatically at 11 AM each day. Looking at the 24-hour maximum and minimum will always tell you the highest and lowest values observed since the most recent 11 AM.

If you like the 24-hour function, you will never want to reset the device manually. There's no way to reset the "all time" maximum and minimum without restarting the 24-hour function. If you use it that way, you will normally want to look at the 24-hour maximum and minimum rather than the all-time maximum and minimum. However, displaying the maximum/minimum always defaults to "all time" and you have to make another button press to see the 24-hour values. Not a big deal, but an odd design choice.

The unit I received had a defective humidity sensor in the base station. The company provided a replacement at no cost to me and with minimal hassle.

I waited about a week before I wrote this review just to see how it worked and the accuracy of the units. I ordered one extra transmitter to keep a track of the temperature in my garage, since the garage faces north and is always cold. I also needed to know what the humidity is in it and also during the summers, how warm it gets in there since I keep my home-canned goods and other staples in my "garage pantry". I also needed to know the outside temperature and humidity measured on the north side of the house. We have another sensor that gives us the temperature, wind speed, humidity, etc. on the southwest side of the house. Now, back to these units, it took them between 3-4 minutes to "settle down" and give me a true reading. Of course, reading all the other reviews, I paid close attention to what others said, and I was patient. I compared the ThermoPro units to the one we have existing in the house, my WeatherBug App on my phone, and the TV broadcast, amazingly, all of the readings on these three units were identical. The TV broadcast was way off. Even NOAH was the same as these three units. (I just wish I was getting the salaries the TV personalities get to make "educated guesses" and be wrong 50% of the time (lol).)

Back to the units, the transmitter that comes with the receiver does not have screws on the back to install/change the batteries, reset or manual transmit. It just has a cover, which fits quite snugly. The additional transmitter does have the two tiny screws at the back for the battery compartment. If you change the batteries atop a paper towel, the chances are slim you will lose the screws. And just in case you do, you can either purchase new ones or, as a quick fix, you can use some scotch tape to secure the back. Problem solved. I did take up the suggestion of another reviewer to use Velcro to attach the transmitter(s) to the walls so that they will be mobile. Loved the idea. Installed my two transmitters with Velcro and am very, very happy where I placed them. The receiver is on my vanity so that it is easy to check the outside and inside temperatures while getting dressed. The readout is easy to see having large numbers. The background light is exactly as picture, but I don't need it since I'm asleep at night or have the light on in the morning. I do have the readouts in the scroll position and that is a terrific feature if you have more than one transmitter. This little unit has the capacity for three transmitters, but because I have two, the third channel has blank lines (obviously) and this gives my husband and myself, the visual to know that after the blank lines appear, channel 1 is the next readout (outside temperature) and channel 2 is the garage readout.

Simple to install, immensely accurate and totally affordable. I totally recommend this product.

Initially, I was very pleased with this item - but after three days, the outdoor portion stopped working and I was ready to return it. However, I did some research on these types of thermometers and in most of the directions, it said something about using Lithium batteries if you have extreme cold. Well - since we had been sitting at below 0 temps for 2+ weeks, I decided to try the Lithium batteries - I now have a working product and am very happy with it - I think the folks marketing this and writing the instruction manuals should add this piece of information as well. That's the only reason I didn't give it a 5 star rating - Just a heads up.