1.Advanced Waterproof Technology. 2.PS/2, USB available. 3.Laser printed keys ,never fade 4.High performance in Internet and high quality 5.Co***tible with Windows NT/98/ME/2000/XP/Vista Inner Packing :1pcs/box Outer Packing:20pcs/ctn MEAS : 480x 380 x 375mm N.W.: 13kg G.W.: 14kg