Purpose: Laptop/PC Device interface: USB Keyboard number of keys: 21 Power source type: USB Black Whether for numerical inputs, controls or for frequent number entry - the programmable keyboard is the ideal accessory for notebooks. All keys can be user-defined with up to 24characters per key.- Individual keys with Gold Crosspoint contacts (ML technology)- Designed for continuous usage - over 20 mill. confirmations per key- Numeric block with 4 additional, individually inscribable function keys- High level of reliability and unique precision confirmation feeling- Programming of alternative key codes e.g. [.], [,],[00], [000]- Suitable for left and right-handed use Features Keys operating life 20 million characters Keyboard number of keys 21 USB hub No Pointing device No Purpose Laptop/PC Device interface USB Design Certification c-tick, UL, VCCI, CE, FCC, VDE, BSMI Product colour Black Cable length 1.75 m Ergonomic design No Power Power source type USB System requirements Linux operatin