A computer mouse is an input device to control on-screen objects.
A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside-down mouse with an exposed protruding ball.
USB Optical Mouse HP Black 3 Button Mouse 361781-003
USB Optical Mouse black/silver Dell ODJ301
USB Optical Mouse HP Black 672652-001
USB Optical Mouse DELL Unpackaged OYH958
PS/2 Optical Mouse HP Black/Silver 417441-001
PS/2 Optical Mouse HP Black 600553-002
USB Optical Mouse black/silver HP 265986-011
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