I know I mentioned this is the video, but while it comes with a clamp I would suggest that you don't use it. I have used it with and without the clamp and I think it's better without the clamp. It falls off and then the kids think they broke it and it just takes up time. There is a permanent mounting bracket you can get if you want to permanently mount it somewhere.
So since writing is not my strong suit and I'm not good at conclusions, I'm just going to leave you with this: You need at least one of these sharpeners in your classroom asap. I regret not getting one sooner.
Classroom Friendly Supplies has provided me with this sharpener for purposes of providing a review. I received it at no charge to me and I am under no obligation to return the product but can keep it for me own personal use. In addition, the above link is a referral link.