3500dpi Razer Precision 3.5G infrared sensor
Ergonomic right-handed design
1000Hz Ultrapolling / 1ms response
Five independently programmable Hyperesponse buttons
On-The-Fly Sensitivity adjustment
Always-On mode
Ultra-large non-slip buttons
16-bit ultra-wide data path
60-120 inches per second and 15g of acceleration
Zero-acoustic Ultraslick Teflon feet
Gold-plated USB connector
Seven-Foot, lightweight, braided fiber cable
Approximate size: 128mm (length) x 70mm (width) x 42.5mm (height)

System Requirements
PC: Windows XP /X64/Vista/Vista64 (Windows 7 drivers are available for download)
Mac: OS X (v10.4 and above)

NCIX Price: 39.99 (Based on my postal code, NCIX offered me Free Shipping to their warehouse, but your milage may vary)

http://ncix.com/products/index.php?s...ProductDetails

Comparative Prices:
Amazon: $64.99 (went on sale in early Nov for 44.99)
Best Buy: $56.98

Note: I had this mouse for over 2 years and I loved it. I think it was the most comfortable mouse I've ever owned.