Made in silicone, environmentally protective and ideal for resistance against drink or food spillage's at home or at work Waterproof-ideal for use in adverse, humid or even low-level water conditions. The ability to roll up the keyboard makes it one of the most space saving computer peripherals on the market today. The colorfast printed letters won't come off even after long periods of time. No noise while typing Harmless to the human body with excellent softness Portable with the proper size to fold or roll Resistance to the water or dust Easy to work for its round shape design Excellent and various in colors Long durability (one million life cycle of key) Compatibility: IBM AT, Windows98/2000/XP/Vista Communication: PS2, USB, COMBO(USB+PS2) Port Color: Any color as require Language: Any language as require Certificate: CE & FCC & RoHS