Used to track the tool if it is stolen or lost. So far it seems to be working. You don't have to track it far. Milwaukee maintains a free app with this device and after testing it works. Defect? It's huge. I've put it on top of a battery pack attached to a drill press, haven't used everything I've bought by the way, and it's sticking out like a sore thumb. The included adhesive backing wasn't up to the task, but a little judicious use of epoxy solved the problem. disadvantage two. It's easy to turn it off. This is a twist lock that must be disassembled to replace and activate the battery. So all you have to do is flip and throw it to make it useless. But can I do it again? no However. I tend to lose my tools on my turf to make them work for my purposes. Hope this helps with your decision.
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