Product review (5 stars): Looking for monitoring with text (SMS) and/or email alerts?  Look no further, this product is for you!
As I post this review this item had only 3 stars out of 5.  I'm writing this review to tell you that this really is a good product but there are a few concerns you need to be aware of.

First, the functionality of this product is superb.  You download the app for your iPhone or Android device, connect the "gateway" to an available Ethernet port on your router, add the "sensor" from your device and in no time you've got wireless monitoring of temperatures.

For my application on more than one occasion someone in the family has left the freezer or refrigerator door open only to come home to warm milk or melted ice cream.  This product solves these problems by sending me a text message (and email) when my preset highpoint temperature is set.

Now the bad news.  Out of the box you get only 3 months of free "enhanced" monitoring capabilities, namely the SMS and email notifications.  Afterward it's $12 per sensor per year.  This may detract you from purchasing this product, for me it's a small amount of money for peace of mind (and lack of food spoilage).

There are a few concerns:

1) Buyer beware when purchasing a "new" model from eBay.  I did this thinking I was saving a few dollars but what I ended up with was a gateway that was already registered to another person and a sensor that had already started its 3-month free service.  La Crosse was able to help me re-register the gateway but they would not restart the sensor free period.  For the extra few dollars I'd recommend just buying one from here so you get the full manufacture's warrantee and the full 3-month complimentary period.

2) The distance from the sensors to the gateway is limited to 200 feet.  When on the phone with tech support about the gateway, the support person informed me the 200' distance was "open air" and suggested the range decreased rapidly with anything between the sensors and the gateway.  I put my first sensor in the basement fridge which provided many obstacles but I'm happy to report that the gateway still saw my sensor with a very high link percentage (94%).  So this is just a gentle warning that you should be aware of the distance issue.  For me, it's a non-issue and for most typical homes this won't be a problem for you either but you should be aware.

3) Finally, just keep in mind, after the 3-month complimentary period, if you still want SMS and/or email alerts from your sensor(s) it will cost you $12/yr billed annually per sensor.  That's only $1 per month and to me that's reasonable, you may feel differently.

To wrap up, this is a REALLY GOOD product.  There are a few sensors options available, some of which include 2 temperature monitors (the device itself and a remote wired dry (or wet) sensor).  They also offer a leak detector which presumably detects water in your basement or other location.  I really didn't go too far into the app functionality but in a glance you can see the status of each sensor along with very nice graphs of both daily or weekly temperatures.

A few other reviewers suggested technical issues with the network.  I'm a technology person so these things come easy to me.  In the unlikely event that you have a network connectivity issue, you may be a bit challenged but I would bet the La Crosse tech support could solve most issues.

I'd highly recommend this product.