Natural Ergonomic Keyboard
In September 2005, Microsoft introduced the Natural Ergonomic Keyboard 4000. This keyboard provides a significantly changed ergonomic design, an integrated leatherette wrist rest and a "hump" in the middle of the keyboard that ensures that the wrist angle is correct. It also ships with a removable front stand that allows the fingers to drop naturally onto the keys without any bending of the wrist. Additionally, the home/end key location set has been fixed by returning to the standard 2×3 horizontal rectangular layout. The F Lock key now defaults to "on", providing the original function key features rather than the new "enhanced" functions, and retains its setting across reboots. The 4000 is also significantly quieter to type on. With this model, there is less of the distinctive "click clack" noise that is common with older keyboards. The space bar, however, has been reported by several reviewers to be unusually noisy and difficult to depress. Unlike its predecessor the Natural Pro, the 4000 does not include USB ports for additional devices such as a mouse.
With most Microsoft keyboards, software (Microsoft IntelliType) is bundled for both Mac OS X and Windows, allowing users to customize the function keys and modify keys fairly extensively.
The Natural Ergonomic Keyboard claimed life of one million actuations for each QWERTY key.
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