The new eye gaze accessory for the DynaVox Vmax (EyeMax)
From Dyna Vox Site

With a simple blink, click of a switch or by dwelling on the desired area of the screen an augmented communicator will be able to access all of the current capabilities and content of the DynaVox Vmax. The new EyeMax accessory can be added to any Vmax that has either 512MB or 1GB RAM and can be removed as needed for evaluations.

http://www.dynavoxtech.com/products/eyemax.aspx