Lets just be honest. When you plug any Alti-2 product into a USB into your computer, the OS will never find the correct drivers for it. Their own website will not give you any troubleshooting tips or driver downloads. They blame a "3rd party software," Paralog, for any incompatibilities. Paralog is supposed to connect to Alti-2 products, but it never will. If you do ever ask for help, the response will be minimal, mostly excuses, and unhelpful in every way. If this were a $120 altimeter that kinda worked, it would be a great product. For $300 you can do much better. Oh, and this one costs $400.