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Features :
High Definition laser technology for more precise, more responsive, and smoother tracking
2.4GHz Bluetooth with First Connect Technology so you can connect wirelessly right out of the box
Four-way scrolling button with Tilt Wheel technology for greater efficiency and comfort when ripping through long documents or web pages
Fully rechargeable so you save money on batteries, includes a battery-status LED indicator
Runs on one AA NiMH battery, and requires a PC running Windows XP (with Service Pack 2) or Windows Vista, 45 MB free space