SmartNav 4 is the product of over seven years of customer feedback and is the next generation of head tracking technology. Our design team has worked hard to ensure that the updated version exceeds the expectations of both our assistive technology and ergonomic customers. The SmartNav 4:AT package is the total hands-free mouse alternative for people with ALS, spinal cord injuries such as quadriplegia, muscular dystrophy, and other special needs. With Assistive Technology prices exceptionally high and exploitive, the SmartNav 4:AT provides a tool for communication and activities otherwise impossible to achieve. The SmartNav 4 includes improved light filtering and tracking, longer range (up to 6' from the unit), three times the resolution of SmartNav 3, a new aluminum case, improved mounting options (including 1/4-20 thread mounts for standard tripods), detachable USB cable, and much more. Complete Computer Control: SmartNav comes with everything you need to control your computer using only your head motion. This package is the ideal solution for Assistive Technology applications as it provides everything needed to have complete control of your computer without the need for hands. Dwell Clicking: You can left click, double click, drag, right click, and more - with our "dwell click bar" software application. Natural Motion: SmartNav was designed to complement the natural head motion you already perform when looking around. Moving your head less than a quarter inch easily maneuvers the cursor across your entire screen. Virtual Keyboard: You can type on your computer screen with SmartNav's virtual keyboard program. Switch Input: You can plug a click switch or a footswitch directly into the back of the SmartNav. With the Y Breakout Cable (included), you can plug in separate click switches for left and right clicking.