Has anyone ever tried the UVSunSense bracelets? I would love to hear some opinions before buying them, although a package of 7 sells for less than $6 on Amazon.com.

After you apply sunscreen to your body, apply a drop of lotion to the wristband where it says "Apply sunscreen to this side." The band turns purple indicating it's been activated. When you've absorbed too many harmful UV rays, the band turns brown, telling you it's time to get out of the sun or reapply sunscreen.