Ledger Nano S is a secure Bitcoin and Ethereum hardware wallet. It connects to any computer through USB and embeds a built-in OLED display to double-check and confirm each transaction with a single tap on its buttons.
Looks like a pretty cool device for dude with big amounts of ethereum.
What do you think?
https://www.ledgerwallet.com/products/12-ledger-nano-s
https://www.reddit.com/r/ethereum/comments/4v77dt/ledger_nano_s_ethereum_hardware_wallet_shipping/