Electronic Gremlin are the best known
I have one of these living in my usb port on my laptop
They can come quite small, as compared to the normal house grelims that steal one of your socks
I once saw a house gremlin's hand sneak out from under my bed and attempt to grab a sock i had just taken off.
I shouted,"I see you'', and the little greenish brown hand shrivelled right before me!
If you spot a gremlin in the act of gremlary, and whatever part that you see, shout,"I see you, and the visible part will shrivel to dust.
You must acknowledge that you have seen the gremlin even if you are stunned and frightened by what you have just witnessed, or it will assume that it was unseen and will not be hurt.
I have as yet have not seen a full gremlin and turned it to dust,but There are a lot of one handed gremlins in my house now.
Little kids see alot of gremlins and acknowledge it, this is why home with kids have alot of dust.
House gremlins are disgusting creatures and feed of the fungus and bacteria that grows in used socks, but they only like to take one sock to see and hear the irritation on the faces of their victims.
They will eat the yuck in a shoe and remove to an unseen location, but the shoe is usually too big to fit in the crevice where they live(they have the ability to squeeze themselves to a few mm in width and compact the density of their bodies so they don't take up much space when they hide!)
They are also fond of taking the right hand of gloves to cover their shrivelled stumps
They have been known to take used underwear..bleeeeccch!
Electronic gremlins is a whole different species in size and the food they eat
They are fond of lead/tin solder and the covering of wiring
and they can be a as small as .05mm
You may have mistaken one crawling on your keyboard for a flea or mite
If you see such a thing, saying "I see you'' still destroys them
(sac)rament