Apple iWatch could literally have your back with UV exposure sensor
The chips do more than protect you from getting a nasty sunburn. They can also measure heart rate, pulse and blood oxygen level. Using infrared and ambient light meters, the sensor can also double as a proximity and a gesture control sensor. And the cool thing about these sensors is that they are just 2mm square. Why, at that size they could easily fit into something like a watch.
The analyst sees Apple selling as many as 10 million units of the iWatch in 2014, assuming that the timepiece doesn't launch too late in the year.
source: Barron's via AppleInsider