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keyboard mouse Products Function*2.4GHz wireless transmission maximum effective distance is 6-10 Meters.*16 channels and automatically switch the working group of up to 60,000 security codes to prevent outside interference comprehensive.*Nano mini receiver ,plug & play,intelligent connection technology without code.*The mouse with internal memory,replace the battery without re-code.*800-1600DPI adjustable cursor velocity.*Left and right hands can be applied.*MINI Receiver inside design,Power Switch.*Can work on any surface except glass,Compatible with Windows95/98/NT/ME/2000/XP/Vista.*Four Section Energy saving design, two pieces 3A Alkaline Cell can be used for about 3 month.**The effective distance relates to the environment conditions.**Battery life depends on the habit of personal use of the mouse may be different.Products Function Parameter*Wireless Carrier Frequency:2402MHz-2480MHz.*Wireless working channel:16 channels automatic frequency hopping.*Rated Voltage:3.0V.*Rated Current:15mA.*Track System: Optical.*Key-Press Life: over 1,000,000 times.