The keystone pro uses QR codes to transmit transaction data between the hardware wallet and a software wallet, eliminating the need for USB or Bluetooth connections.

This method ensures that private keys never leave the secure environment of the hardware wallet and are never exposed to potentially compromised devices.

This form of air-gapped communication improves security by minimising the risk of malware infiltration and unauthorised access.

The Keystone has a fingerprint login option.

The Keystone is only for experienced users as it does not have its own app and only works with third-party apps such as Metamask.

Plus points:

Security.

Good support.

Nice colour screen.

Fingerprint login.

Cons :

Not for beginners.

Does not has its own app 

Firmware updates required.

Battery not replaceable.

Battery drains quickly, even when not in use, it loses 
14% per day!I

Discount link for the Keystone 3 Pro.