Track the ball keyboard Interface: USB or PS/2 Compact design, elegance shape for 1U rack-mount and other application Specifically designed for IPC, military, medical and OEM applications Integrated with trackball or touchpad 1,000dpi (40 point/mm) for touchpad Fast keycap 400dpi for trackball Net weight: PS2 640g, USB 630g +/-30g Gross weight: PS2 782g, USB 772g +/-30g Key numbers: 87 keys (English) to 89 keys (Japanese), according to the languages to distinguish Cable length: 1.5m Key stroke life: over 10 millions times Key operating force: 60+/-20g Operation voltage: 5V DC+/-0.5V, 60mA maximum Operation system: Microsoft Windows 98 SE, ME, 2000, XP, Vista, Linux Packing: 10pcs/carton Product measurements: 400 x 133 x 13mm Carton size: 430 x 405 x 195mm gross weight: 7.7kg Net weight: 8kg