That's right, that's a real guitar amplifier inside that toaster. It's a Hottie Amplifier, available in a variety of toaster styles for $149.
There's a solid-state amplifier shoehorned inside there, powered by a 9-volt battery, and the sound comes wafting out the vintage American toaster's slots courtesy of a 6-inch Jensen speaker.
Who could resist the idea of first getting toasted, then having a hot jam session, laying down some smokin' licks until your ears turn to toast. It's distorted, but sometimes that's a good thing.