This is not a pen that connects via Bluetooth. It also doesn't support tilt, pressure, and has no palm rejection. It seems to be some kind of capacitive stylus except the tip is way smaller than ordinary capacitive styluses (the spongy pens or the ones with the gimbaled disc).

I did not think it was possible to have such a small contact area and still be picked up by the touchscreen. It also needs to be charged. Is it interacting with the touchscreen's electrostatic field in a more pronounced way using the internal battery?