Flexible keyboard compatibility: IBM, Windows98/2000/XP Communication: PS/2, USB, Combo (USB + PS/2) ports Flexible keyboard layout: 109 keys Electronic data: +5V DC, 250mA Flexible keyboard total travel: 2mm 4% Made of silicone, environmentally protective and ideal for resistance against drink or food spillage at home or at work Flexible keyboard available in any color Roll keyboard available in any layout /letter /language Moisture prevention: Waterproof, ideal for use in adverse, humid or even low-level water conditions Flexible keyboard compact size: The ability to roll up the keyboard makes it one of the most space-saving computer peripherals on the market today Roll keyboard: Manufacturer the colorfast printed letters won't come off even after long period of time, No noise while typing Silicone flexible keyboard with excellent softness, harmless to human body Portable with the proper size to fold or roll Factory resistant to the water or dust Round shape design, easy to work on High durability: One million life cycles of keys Roll keyboard application: Hospitals, offices