Surprisingly you can run most consumer electronics with a wall wart power supply of '
"12 volt" automotive power. I've ran a bunch of network gear rated for 5 to 14 v just fine off car voltage. Kept expecting for things to not work or let the smoke out, but never had a problem. Probably not the best plan for maximum life or reliability though.
After years of poking wall wart power supplies with a multimeter it's surprising how many are off their rated voltage by a volt or 2. Makes you realize how low precision they are & how tolerant electronics need to be.