Here is a smartwatch that tracks your daily activity and UV exposure. The O’We Smartwatch can tell you the amount of sun exposure you need based on your skin type, UV readings, and location data. O’We also tracks your sleep and fitness activity. It also connects to your smartphone to keep you connected.
O’We has a colored e-ink display that is easily visible in sunlight. The battery lasts up to 5 days. More info is available here.