Material: silicone, environmentally friendly Multimedia function: one-key control for audio / video playback, E-mail access, and Microsoft Office applications Available in various colors Available in all layouts / letters / languages Waterproof, ideal for humid or even low-level water conditions Compact size: space-saving Colorfast printing of the characters on the top of keys, type without noise Resistance against dust One hundred and fifty million life cycles of keys Usage: libraries, offices, cyber-cafes, boats and call centers Compatibility: IBM AT, Windows 98 / 2000 / Me / XP Communication: PS2, USB, combo (USB + PS2) ports Layout: 127 keys 5V DC, 250mAh Total travel: 2mm Certificate: CE & RoHS