Product specifications: ModelM-105Wireless technology27MButton3Keystroke route0.8mmKeyseitch operation force70±5gKeylifeAbove 3000,000timesRated working voltage/currentDC 3V/35mA System support Windows 98SE/2000/XP/VistaCertificate FCC/CEFeatures:1.27M wireless transmission, working distance is 1.0-1.2m2.Technic resolution is 800CPI;3.No need the code,.easy plug and play.