When reading the glowing reviews it’s difficult to find one that explains exactly what about this product they love so much. I question if some of the rosy reviews actually used the product. There are several very important things you need to know and it seems only the 1-star reviews even mention them, so read them. Here is a summary of why I sent mine back. I know this is a little long … read at least the first part, then after that there’s an optional section about the set-up process horror story.NOT 100% WIRELESSThe first is this is not truly a "wireless" product as described. It absolutely needs wires to operate and you absolutely must have a spare available Ethernet port on your router to plug it in to (using a wire). The vast majority of routers sold today only have 4 available wired ports and many people already have 4 things plugged in. In today's typical home there are a LOT of things that run on the internet, fortunately most are wireless but some (like many home video security systems and older legacy devices) must be plugged directly into the router. In my house I have 22 wi-fi wireless devices and 4 wired Ethernet devices. There is absolutely no reason a "toy" like this shouldn't have been designed to be wireless like the majority of gadgets sold these days, even ones that sell for 15 bucks. Having to plug something into a router is NOT wireless. Memo to La Crosse ... wired home internet is dead, wake up and smell the wi-fi.NO POWER – NO PROTECTIONPart two of it not being wireless is that the part that plugs into the router must be plugged into an AC outlet to work, using a wire. The seller makes a point that the remote sensor is battery operated but glosses over the fact that the gateway needs to be plugged in and if your electrical power goes out their product is for the most part useless. I can't see how some people rave that this will protect a freezer full of meat ... barring your freezer blowing up (unlikely) the #1 cause of meat going bad in your freezer is a power failure. If there is a power failure your router is going to be dead, if your router is dead it is impossible for the required gateway to operate to send you a temperature reading that your freezer temperature has dropped into the danger zone. How can that possibly be a good thing?STONE-AGE TECHNOLOGYOK. I didn’t send it back immediately. I was able to jury-rig a way I could use the sensor. Earlier I called it a "toy". The device is not very accurate, which can be critical for certain situations in which temperatures must be kept within a specified range.Some other things to consider ... the fold-out piece of paper in the box is among the worst instructions I've ever seen for any product. It is written in 1990's IT techie jargon that overly complicates every one of the exceptionally few words. La Crosse seriously needs to hire people who know how to communicate. The online support page is just as bad other than one video that does an only fair job of describing the setup process. Finally, I'm baffled why additional add-on sensors at Amazon (you can use up to 4) can cost more each than the entire start-up kit which already includes one sensor. And then they want to charge a monthly fee just to use their product, while there are competitors who sell the same kind of thing with free remote access.How can someone say they love this thing with so many major strikes against it?[OPTIONAL]Here is La Crosse’s arcane 1980's pocket-protector process of setting their product up:1. The instruction sheet only tells you the first step which is to plug the hub in a router, then plug the hub into a power outlet. Most outlets only have 2 plugs. I have my modem plugged into one and my router into the other. Both are in a hard to reach crawl space so I have to go find an extension cord to be able to plug the hub in.2. I go back inside the house and install the app on my phone. There are no written instructions after that first one on the fold-out piece of paper. The app won't work without me giving them my email address. I submit it.3. The first thing the app tells me to do is to go BACK to the hub and enter the serial number that's printed on the bottom (are you kidding, haven't they heard that it's 2017 and today's devices find themselves?) So I slither back into the 120 degree crawl space to get the number that they could just have easily printed on the box.4. It says it will take 30 seconds so I go back inside the house go move on to the next step. The next step is to go BACK to the hub in the hot crawl space and press the button (again). You’re telling me that there is NO ONE at La Crosse who could figure out they could have printed ALL of the steps on an instruction sheet so I would know what to expect without the game playing surprises at each step of using the app?5. The next step is to register the sensor. You guessed it; you do that by crawling BACK under the house again and pressing the button on the sensor then pressing the button on the hub. Ah, but success, it works.6. It works that is until I walk back into the house and it immediately loses the signal. Note that at this point I am all of about 6' away from the router with only one standard wall separating the sensor from the hub. It makes me START ALL OVER AGAIN FROM SCRATCH!7. On the second try it totally gives up and tells me the factory has to reset it for me which is done by calling an area code 608 number and trying to reach customer service. It should be noted that at that time it was 5:01 PM on a Friday where their office is located.Step 8 - I threw everything back in the box and returned it to Amazon. This company is pure evil.