You may be used optical, wireless mouses till now. wireless Trackball M570 was launched by Lagitech company. Wireless Trackball M570 was launched by Lagitech company. They have arranged a track ball near to thum finger. so it will be more easy to move the curse wherever you want in less time. There are back / forward buttons arranged on it. After connecting the receiver to the system you can use to mouse at a distance of 10 meters.
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