Coldcard is an easy to use, ultra-secure, open-source and affordable hardware wallet that is easy to back up via an encrypted microSD card. Your private key is stored in a dedicated security chip. MicroPython software design allows you to make changes.
Control over your money
This wallet gives you full control over your bitcoins. This means no third party can freeze or lose your funds. You are however still responsible for securing and backing up your wallet.
Payment validation features are provided by the software wallet you use with this device.
The developers of this wallet publish the source code for the client. This means any developer in the world can audit the code. However, you still need to trust developers of this wallet when installing or updating the final software because it was not built deterministically like Bitcoin Core.
Very secure environment
This wallet is loaded from a secure specialized environment provided by the device. This provides very strong protection against computer vulnerabilities and malware since no software can be installed on this environment.
Privacy features are provided by the software wallet you use with this device.
Variable fee control
Fee control features are provided by the software wallet you use with this device.