In general, I am satisfied with the purchase - the design is magnificent, the surprise of friends is guaranteed. If the price doesn't scare you, take it. Pros below: First, a few clarifications: it has four keys, not one. The ones closest to the user act as the right and left mouse buttons, the top ones - media control and image viewing. A large and massive ball in the hole lies freely, it can be removed and washed if necessary. Optical sensors are located along the walls of the well. In normal mode, the ball moves the cursor, the rotation of the ball in the horizontal plane scrolls the page. In multimedia mode, you can scroll through tracks and change the volume with a ball, however, this only works in WMP and iTunes. In the "Document View" mode, you can zoom in on the image, but it seems that this is only possible in the "seven" - I have XP. For a trackball, the control is not bad - thanks to the thin profile, the hand can rest against the table. Works with all operating systems, the driver is downloaded from the manufacturer's website. With its cons: The inability to reconfigure the keys - I especially miss the "back" function.
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