MS-048O The wired mouse uses the latest technology of optical sensor and digital processor to scan the surface beneath the mouse without a ball to ensure its high accuracy performs & smooth movement on almost any surface. Features: ?Enhanced optical sensor- Sealed in optical sensor to eliminate erratic cursor movement and dust accumulation to ensure a longer lifecycle. ?Unique wheel buttons- Let you scroll easily through Windows & navigate on Internet. ?3 buttons- With smooth application in operation. ?No mouse pad required- Can work it on any rugged or glossy surfaces.