Product review (5 stars): DFW311
We bought four of these at once. One was DOA (defective) and Amazon promptly issued an RMA and a promised credit.

For the three that worked perfectly, we're very happy. We're using these to verify temps in our commercial office building. We're tracking temps in our server room and individual offices.

Each unit arrived in a plastic package that appeared to require scissors to open, but, thankfully, opened easily with fingers. Contents included the device itself, a clear plastic cover for the USB end of the device (it also covers and protects the activation button), Lithium Ion battery, mounting clip/holster, screws for the clip/holster and a mini-CD for the software.

One note: don't install the software on the mini-CD that comes in the packaging. Go to [...] and download the latest version from their web site. The CD contained v2.0 while the web site had v5.0.

We installed the software on Windows 7 32-bit, Windows XP Pro and Server 2003. All worked fine. We configured the devices and deployed them for several days. Make sure you set C or F for temp as the software (amazingly) cannot convert once it's logged. You can configure them to start recording as soon as they are configured or wait for the button to be pushed. These units are detached from the PC's USB port after configuration and can be placed or mounted where ever you wish. One was taken home for the weekend and started once it was there.

We easily downloaded the logged temps and displayed charts for analysis. We've only had them a week and find them valuable. Our only wish list item at this time would be the ability to overlay multiple charts to compare multiple loggers on the same chart, but that's a minor issue.

For the price, these are an amazingly good value.