Maltron Head/Mouth Stick keyboard
MALTRON Single finger or Head/Mouth stick keyboards have a unique shape and keyboard layout. The shape matches natural head movement and the ergonomic key arrangement minimises finger or stick activity, raising speed and relieving frustration.
Push-On, Push-Off keys are provided for Shift, Control and Alt.
You can turn off key repeating at the keyboard if it is not wanted. If allowed by the application software you are using, the repeat rate can be set to SLOW, MEDIUM or FAST at the keyboard.
More information: http://www.maltron.com/shop/product/5673-maltron-head-mouth-stick-keyboard-for-the-usa