I bought 2. Both were in stock. They work fine. The authorization can be set. Since I have a slight twitch I find it best to use it low. The buttons are strong. The ball appears to be a standard size, so if you lose it there's a replacement. I also have Logitech and Perixx trackballs. The quality is similar but it was cheaper. The function of the button is programmable. I'm happy.
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