How does Cobo Vault work?

[bitbro678]

How does Cobo Vault broadcast to the blockchain? WiFi?

[Dragonbro123]

Looks like it's using a mobile app as the hot device to broadcast transactions to the blockchain. From what i've read, the cobo vault has no network connections or usb.

https://www.youtube.com/watch?v=EIscmKkvDUs
Love this guy's vedios and get to know cobo vault from him

[bob123]

According to the website it doesn't have a WiFi chip at all.

I believe the transmission from the cobo vault to the mobile phone happens via scanning QR codes, and the broadcast itself is happening from the mobile.

However, a hardware wallet which claims to be extremely secure 'because of no communication channel' while at the same time using updates via a SD card, shouldn't be taken too seriously.
Without any further information about the EXACT handling of firmware updates, one could theoretically create a malicious update (spread via mobile application vulnerability for example) to compromise the cobo vault.

Note that i do not intend to say that there is a vulnerability, i am just mentioning the 'easiest' way to eventually attack this wallet (without further information about this wallet).
No wallet is 100% secure.