There are multiple sizes, including ones that barely stick out of a USB-A or USB-C port. The keychain form factor is for convenience. I have multiple keys in mu

There are multiple sizes, including ones that barely stick out of a USB-A or USB-C port. The keychain form factor is for convenience. I have multiple keys in multiple sizes for 3 or 4 years now, none fell to mechanical damage (but one pretty much stopped responding to touch, requiring replacement).