The sun can get pretty intense depending on where you live. If that is a concern for you, then you should check out this band, which will hopefully help keep you from getting singed from the sun.
The UVeBand will allow you to sunbathe without worrying to much about getting sunburned. This slap-on bracelet will monitor solar exposure, and vibrates whenever you need to apply more sunscreen. It will start working after you’ve applied your first layer of sunscreen, and it will automatically turn itself on. Vibration alerts will be sent to your smartphone every 15 minutes. The band keeps track of UVA and UVBs, and uses the solar power to operate its circuits.
The UVeBand was launched as a Kickstarter project, seeking to raise £80,000 (~$120,000 USD) by April 7, 2013. You’ll have to pledge £8 (~$12 USD) to get yours.