Wow this is really a great product for someone who stays under the sun for so long especially for civil engineers like me who is always on site

Pros:

• It will assess the necessary infos to suggest the allowable time duration for you to stay under the sun. Data can be acquired easier through an app
• Does not need to be charged and it is very easy to wear

Cons:

• Seems like it only has a limited life span. You still need to purchase a number of it as needed