The trackIR 4 is very light. The weight of the cable is sufficient to move the trackIR - I find it very hard to position mine and have it stay in place for extended periods of time.
It would probably be an idea (and very cheap!) to include something (like adhesive bits of velcro) in the package to help alleviate this.
Include some velcro or something in the box please
Re: Include some velcro or something in the box please
What type of monitor are you using?