One , outstanding value for money 
Two,  an advanced technology laser engraving characters, never wear 
Three,  mute design, comfortable touch keys
Four, built with weights, 800CPI precise positioning
Five, superior quality, reliable and durable

Product Specifications:
Keyboard:
Power button: 55 +7 g
Key life: 10000000 times
Key drawing force: &; 1Kg
Operating temperature: 0 ~ 45
Mouse:
Resolution: 1000
Button life: 3,000,000 times
Wheel Life: 100,000 ring
Working temperature :0-45

System Requirements:
Compatible with Windows95, 98, ME, NT, XP, VISTA operating system and above
Compatible with IBM-PC compatible PS / 2 Password

Big order big discount , please contact with me !