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Kensington PS/2/USB Orbit Optical Trackball
 
Kensington PS/2/USB Orbit Optical Trackball
Kensington Orbit Optical Trackball - USB w/PS2 Adapter
$19 to $42
AliMed Kensington Orbit USB/PS/2 Trackball
 
AliMed Kensington Orbit USB/PS/2 Trackball
Orbit USB/PS2 Trackball feels like a mouse, but allows precise fingertip control. Hand-hugging design and gentle upward slope provide wrist support to ease fatigue.
$63.80