I have bitter experience with Fitbit flex.
The watch strap is very delicate and damaged very soon.
Without the strap we can’t do anything. So I request the manufacturing company to supply at least 5 straps with Each devise.
This is my humble suggestion.
Otherwise without a strap we can’t wear it and use it.
The very purpose of buying this product is Defeated .
It is a new product for me .so I was very careful while using.
However, due to broken strap I could not use it.