Currys
VIVANCO 36640 Wireless Optical Mouse Black

The Vivanco�36640�Wireless Optical Mouse�is a reliable office tool to boost your productivity.
It has two extra buttons on its side, which you can use to navigate back and forth in a browser or documents.
Once you get used to it, you won't go back to a three-button mouse.
With the DPI button you can change sensitivity - great if you want a quick precision boost or to share the mouse with someone.
The wireless receiver is tiny, so you can pretty much leave it in its USB port, it barely sticks out.
There's a storage slot for it inside the mouse too.

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