ウィスパー

The motor is seriously impressive for something this small, it packs way more punch than I expected from a pocket toy. I took it to work in my jeans pocket and honestly forgot it was there until I needed it.

Pocket-sized is right—it disappears into my palm, and the whole thing is quieter than I expected, which matters when you're trying to be discreet. Solid little thing for a quick session, though I wish the button were a bit easier to find in the dark; still, gets the job done reliably.