USB Negative ION Generator vs Teflon Tube on a simple DIY negative static electricity detector

A teeny winny USB negative ion generator vs a Teflon tube.  Verdict: Teflon tube win.

The USB negative ion generator dont seems to be generating enough negative to active the LED.

The negative static electricity detector is build using a P channel MOSFET, IRF9620, a 100 ohm resistor and a red LED, power by a 9V DC battery.

The Teflon tube hold the negative charge very well and will continue to lit up the LED even after a fews hours after charging by rubbing it with a cotton cloth.