OK, I got this unit for the express purpose of integrating it with Alexa, and I am a very happy camper.Now for the details... I ordered this with two accessories;* Venstar ACC0410 Add-A-Wire Kit* Honeywell THP2400A1027W White Coverplate AssemblyWhile I waited, I bookmarked the appropriate Alexa skill;* Honeywell Total Connect ComfortThe thermostat and Add-a-wire kit came first, and since the coverplate goes on FIRST, I had to wait. I went to install the Add-a-wire, but discovered that there was an extra conductor in the bundle behind the wall! OK. For those of you using that, it seemed VERY well put together. There are a couple of Youtube Videos, the Factory version has a cute model, but the contractor-supplied version is more accurate and complete.The unit is smaller than you expect. It's approximately 3.5" H x 4.5" W. You will probably need the coverplate, and mine took about 5 days longer than the thermostat to arrive!The coverplates arrived, you get TWO to select from, depending on how humongous your original thermostat is. The bigger one is REALLY BIG, as you can see from the first photo in this review. The smaller one was fine for me.Installation was by the book, and easy. I'm giving them 5 stars for tech support, because they put MAN-YEARS into the docs, app, and website when they put this together. Instructions are clear and concise. None of this "refer-to-the-app" CRAP you see nowadays, advertised on websites with lots of art, and NO real information. This is HONEYWELL, folks. If you are reading this on an airplane, their stuff is helping to fly you there.The installation was straightforward, you might want to cut off the looped ends from your old-style terminals, and strip about 5/8ths of bare copper for the newer, smaller 'push-insert' style terminals.TURN YOUR HVAC UNIT OFF FIRST. The "C" wire is 24VAC, and I have NO idea what damage you could do to a modern logic board if you short the control wires to it. I blew a logic card in a whiz-bang variable-speed HVAC unit in another house about 15 years ago, and they have you over a barrel...When powered up, it has you step through an initialization sequence, and then register the unit online. DO NOT SKIP THIS STEP. It's not the usual "get your name for advertising" registration, there is a web control panel (also pictured) that is integral to the entire operation. Then you can enable the Alexa skill, and it's off to the races.There is no concise list of commands the skill currently accepts, probably because it's dynamic. The bad skill reviews seem to be from early iterations. This is what I have dug up so far;Alexa, set the temperature to X degrees.Alexa, set the [group name] to X degrees.Alexa, set the [thermostat name] to X degrees.Alexa, raise the temperature by X degrees.Alexa, lower the temperature by X degrees.Alexa, make it warmer.Alexa, make it coolerAlexa, what's the temperature inside?Alexa, what's the thermostat set to?Finally, No more getting up in the middle of the night to walk down the stairs just to change the freaking temperature! Just say "Alexa, lower the thermostat by one degree" and go back to sleep! It wouldn't be so bad if my dog would stop leaving her bones on the stairs... OUCH!