Not sure what your monitor size is ?
Monitor Size: Unknown
Logitech Wireless Mouse M185 is a simple reliable mouse with plug and play nano receiver. Its dimensions are rather tiny at 3.75 x 2.15 x 2 inches.
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Logitech m570 trackball
The size is correct if a use 15.6 as size monitor rather than 17. Monitor Fujitsu-Siemnes 4312FA 17" 1280*1024