# solo > Interact with Solo hardware security keys. > More information: . - List connected Solos: `solo ls` - Update the currently connected Solo's firmware to the latest version: `solo key update` - Blink the LED of a specific Solo: `solo key wink --serial {{serial_number}}` - Generate random bytes using the currently connected Solo's secure random number generator: `solo key rng raw` - Monitor the serial output of a Solo: `solo monitor {{path/to/serial_port}}`