Compact keyboard with integrated trackball and two mouse buttons: the mouse pointer is simply controlled with the trackball - no extra mouse required Individual keys with gold crosspoint contacts (ML technology): The mechanical switches ensure high reliability and a uniquely precise actuation feel Absolutely durable: The robust keyboard is designed for continuous use and can easily handle over 20 million keystrokes without any loss of input quality Space-saving and lightweight: With its compact design and low weight (570 g), the keyboard is ideal for confined spaces and 19’ applications Can be used with standard operating system drivers: Simply connect and follow the installation instructions. Depending on the version with USB or PS/2 connection