Toaster

The Toaster is a prominent Teslanoid that has no known purpose. It doesn't run off of any known power source apart from the possibility of a battery. Used as a normal toaster, it produced an enormous electrical shock, shattering overhead lights but not hurting Nick Slate in any known way. It also completely incinerated the bread that was put into it.

In the F.R.E.E. (Far Range Energy Emitter) it again has a mysterious use, the book quoting that it "produced blue spiral pulses" and later "angrily [shot] out what looked like miniature spiral galaxies". It slots into the F.R.E.E with the Hand Mixer's paddles inserted into the toast slots. The second book says that it took the blue pulses and focused them into the Camera and its lens, making a pure stream of power shot down the bell of the Clarinet.

It has a running joke where it hits characters in the head, mainly Nick Slate. Occurrences of this are first at the beginning of the series (causing a scar that is visible in all of Nick Slate's ages), again in the finale of the second book (causing him to fall off of the attic), and finally hitting Thomas Edison at the end of the third book. Nick Slate references this several times, asking Mark and Cathy to keep it away from his head, and him moving it to a less precarious position in his attic, before laughing and putting it back.