Defender Wired Optical Mouse Netsprinter MM-440 Black+Orange 3 Buttons 1000 dpi Defender Wired Optical Mouse has a durable construction and ambidextrous design Ambidextrous design allows both right and left-handers to use this mouse conveniently. It has a thin and flexible cable. 1000 dpi resolution is optimal for work on 9-22inch screen. Standard mouse with 3 buttons.