No Battery unit, Nwe EAL 6+ security chip, cryptocurrency hardware wallet keeps your private keys offline. All transactions are done securely on the device, so you can rest easy. Closed source wallet is just like a black box; no one knows what is happening inside. Trust code and math, not ADs. Verifiable open source wallet is always the best. OneKey supports FIDO and FIDO2 protocols and works with Google, GitHub, Dropbox, Binance, and Coinbase.