The HP 2004 Standard Keyboards represent a design extension of the successful Easy Access keyboards. These keyboards have the same layout & tactile characteristics as the previous keyboards, but without the hot-keys. Instead, the HP 2004 Standard Keyboards introduce expanded configurability by allowing the keyboard to sit upon the desk at either zero-degree (flat), 6-degree or 12-degree slope through the use of the keyboards tilt legs. Hence you receive a wider range of configurable slope options to maximize your comfort when using these keyboards. The HP 2004 Standard keyboards also simplify System Administration tasks as no additional reprogramming or redirector software is required to be maintained or supported with these keyboards. The keyboard software device drivers are an integral part of the client operating system. This keyboard is compatible with the following systems: Compaq Evo d 310v microtower; Compaq Evo d 310 microtower;HP Compaq d 330 microtower;HP Compaq d 330 desktop; Compaq Evo d 510 convertible minitower; Compaq Evo d 510 small form factor; Compaq Evo d 510 ultra-slim desktop;HP Compaq d 530 small form factor;HP Compaq d 530 convertible minitower;HP Compaq d 530 ultra-slim desktop.