Pros:
- it helps you monitor the amount you should spend in the sun which is otherwUse very hard to judge
Cons:
- the gadget seems only to be suitable to hang on a bag, and you might not always carry one.
How it can be improved :
- I think it would be great to wear as a bracelet with a nice design. This way It would more accurately reflect how much sun you are exposed to and you could wear it one the beach and even when swimming