This device is an USB mass storage device with a micro-SD card that is used to backup the private keys to your wallets. The industrial designers did some amazing work here – its form factor is basically that of a slimmed down USB thumb drive with a slot in the side for the micro-SD card slot, an LED and a corner hole to let you carry this on a keychain.
For me, the Bitbox’s form factor is the best of any hardware wallet. Having said that it’s larger than the Opendime product and it does not have the graphic display of Trezor and Keepkey, and the added security that enables. Lacking a display and the wider footprint that goes along with it means this is lean and probably more durable over time.
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