Wasn't convinced this would do very much, but have been pleasantly surprised. No USB cable as described on box.
Is a chunky USB device, as thick as probably 2 memory sticks together, so need to be plgged in via USB extention cable or may block another port if you have vertically arranged USB ports. I bought it as I get a fair few migraines, made worse by lots of time in front of a PC in my current job.
Since buying this little device, had only one migraine. Not sure if mostly placebo effect, but also definately reduced some of the static around my computer I used to get zapped with!
Would recommend for use with work PC, or laptop when plugged into a USB cable, so you can set it up to point at user, as small not sure would work as well otherwise.
Don't use for allergies etc - get a proper ioniser with a HEPA filter for this.