Specification
- USB 2.0
- 2.4GHz wireless transmission
- 10 meters effective distance
- Compatible with Windows XP / Vista / 7,Mac OS
- Resolution: 1200 dpi
- Size: 11 x 5 x 6cm.. 
Features:
- Combining the trackball mouse with optical sensor
- Can be used on the desktop like ordinary optical mouse
- Unique shape, adjust your posture freely
- Convenient in the narrow space
- Ease the harm of palm joint or muscle for long-time using mouse
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