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This is not a hardside case that should be priced about a third of its current $30. The Kardia Mobile device fits securely in the case, with a bit of elastic to hold it, but I would not trust the case to protect the device from anything approaching rough treatment, such as being loose in a purse or backpack. I carry mine in a padded Epi-pen pouch, trusting the pouch to provide more protection that this thin case.
I would not recommend this product, and wish I had purchased a hardside case for much less. Live and learn.
I have to agree with some of the other reviewers, £25 for a 'felt' case with a magnet is not really 'value' for money. I would not want to risk having this on a key ring / chain as it suggests. So 3 stars for value for money, 3 stars for protectiveness, and three stars for safety. To get five stars it would have to be more sturdy and solid, as well as having a much more effective closure mechanism, and then the price match the value of the item more honestly.
So the case is nice but I thought it was more like a kydex case. This is a felt like case the 15 dollar price tag is a bit steep. I don't feel comfortable putting this on my key chain especially since the device is $99.00 to replace. If this was as hard plastic or Kydex with a slide lock that might be btter