Tube size: 17"/43.2 cm aperture grille CRT  Aperture grille CRT   0.25 mm pitch  1600 x 1200 at 76 Hz  1280 x 1024 at 90 Hz  New deflection yoke  Dynamic focus  Easy to use on-screen menus with Navi™Key control and password protection  TCO'95  Plug 'N Play  Optional stereo sound system   The Nokia 447Xpro is a high performance display for professional Windows and engineering applications. The maximum resolution is 1600 x 1200 at flicker-free 76 Hz. With 1024 x 768 resolution, the refresh rate is 120 Hz.   To ensure excellent picture sharpness and clarity across the screen the 447Xpro features a new deflection yoke, which improves convergence even in critical corner areas. There is also Dynamic focus, which uses a special electromagnetic lens to give you perfect corner to corner clarity.   High ergonomics are guaranteed in accordance with the strict TCO'95 standard. With NokiaCoating the screen reflection is reduced to a minimum, so you can enjoy high contrast images without eye fatigue.   The on-screen menus controlled by Navi™Key, a single press and rotate knob, make adjustments easy.