Durable, reliable, high quality and easy to use - the standard PC keyboard for the most demanding requirements. Timeless design. With FTSC technology to give reliable service. - PS/2-or USB Interface. - High-quality keyboard for professional users. - Membrane contact switches with rubber-mat technology for individual use. - Precision switching. - Keycap symbols are wear-resistant and easy to clean. - Linear key action. - Reliability: MCBF =1 x 10 9 operations; MTBF >80,000 hours. - Individual keys have long service life: >50 million operations.