The Future of Microfluidic Devices

There's no limit to how long it can be used. The sort of usage limiting factor is actually the battery. So if I want to go around the Leadville Char 100, which usually takes me about 20 hours on a good year, I could wear the patch the whole time and theoretically get sweat sodium and sweat rate measurements. But we absolutely knew we had to create a solution that was going to work for this segment.