A Simple Bitcoin Hardware Wallet
KeepKey works with the bitcoin wallet software on your computer by taking over the management of private key generation, private key storage, and transaction signing.
KeepKey generates your Bitcoin private key using its hardware-based random number generator, combined with randomness provided by your computer.
Once your private key is generated, you are given the one-time opportunity to write down a backup of your KeepKey in the form of a twelve-word recovery sentence.
site link: https://www.keepkey.com/