This product has been discontinued and the patent has run out. it is an Infra red Camera which follows a silver dot which can be placed where ever on the face or a hat, I wear my dot on my chin. It is so sort after in the disabled community there are a few things that do a similar type of thing but nothing with the precision of the smartnav 4. I can't do anything like easily type an email or nor am I able to do any 3d designing . Do we think we could try design something that could do the same type of thing to help out the disabled community.