This is the Ergo Armrest, I have been using one for years, it supports your arm, shoulder, or wrist when using a keyboard or mouse. You can use one or two, they sell for around $130 in Canada. They are sold by Microcomputer Science Center an assistive technology supplier in Ontario, here is a link http://microscience.on.ca/store/search/… , at this point I guess I should point out as I often do that I do not sell anything and am not affiliated with any of the suppliers of anything I discuss on this site. If I say I like something its because I do, not because I am being paid. Click this link to watch a good 1 minute video from Youtube demonstrating the Ergo Armrest.