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Feature

It accepts standard psbt transaction (Bip 174) stored on an Micro SD card.Nocompanion 'app' On your computer, works with the major wallets already (electrum, and more to come)
It'scheap! Simple Packaging, plain design, No fancy boxes, no redundant cables
It'sultrasecure! Real crypto security chip. Your private key is stored in a dedicated security chip, not the main micro's Flash
Easyback-up! Micro SD card slot for backup and data storage. This allows truly offline SIGNING, by transferring the Unsigned/signed transactions on sneakers
Open sourcesoftware design runs Microphone and you can change it