Involvement:General (knows how to use it) - Ownership:more than 1 month
The colour changes almost immediatly when exposed to UV radiation. It is useful to test sun glasses, UV lights and sunscreen. Another good thing is that it is easy to use and can be attached to your phone, bag, etc.
Mine came with a blue plastic pendant which I think could be a bit smaller. This accessory is made in a cheaper quality plastic than the rest of the strap.
The package is nice but it´s not in English. It could be a little cheaper.
I recommend it, it is useful to test your sun glasses and a nice accessory to carry on with your belongings.
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