That is awesome @pzd3mir
As long as you keep your seed written down in a very safe place, you may lose your device and it may rot or get broken, just like current Hardware Wallets do.
Those are awesome pictures, I can see the controller. Awesome.
Cheers, man. Thanks for commenting. Any questions further, feel free to ask them
@bitworkers
RE: BOLSHOI - comprehensive IOTA wallet - Hard Work - Working with Hardware