How secure is Mycelium / Entropy?

I have a friend that swears by it but what I'm concerned about is if the serial number or whatever form it can identify any keys it generates. Are the keys completely random or random enough to not be able to be linked back to the device which generated them? He does Exchange/LBC->Entropy generated wallet on Tails->Electrum->Tumbler->Market , does using electrum on tails negate for this device?


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