CLEANTYPE XTRA ROLL compact plastic keyboard with trackball for hygiene sensitive areas and industries - PC keyboard made of high-quality ABS plastic - Lightweight and precise cursor control with optical 22 mm trackball - KeyLock function (Fn + F5) to clean the keyboard without disconnecting it from the computer - Low operating force and easy key strokes - 4 Status LEDs (Num Lock, Caps Lock, Scroll Lock, Power) - Compact size - Fold-out feet to tilt the keyboard for ergonomic working Trackball: Optical technology Diameter: 22 mm Operating temperature: 0°C to + 40°C Storage temperature: -40 °C to + 55 °C