17 MMO-optimized buttons Effortlessly access more spells, abilities, & macros with a total of 17 mouse buttons, including Razers revolutionary 12-button thumb grid. The new Razer Naga features 2 mouse buttons behind the scroll wheel to deliver better ergonomic control as you game. Three interchangeable side panels Three interchangeable side panels provide an optimized fit for different hand sizes & grip styles, ensuring maximum ergonomic comfort to last you through lengthy raids & grinds. Razer Synapse 2.0 Razer Synapse 2.0 is cutting-edge intuitive proprietary software that functions as the Razer Nagas brain “ automatically syncing the gaming mouse to a cloud server to download driver & firmware updates, as well as save individual gamer settings without you needing to lift a finger. Specifically for the Razer Naga, Razer Synapse 2.0 capabilities will be expanded to store settings for a custom Razer in-game UI designed just for MMO players. Learn more TECH SPECS 5600dpi Razer Precision 3.5G Laser Sensor 1000 Hz Ultrapolling / 1ms response time 200 inches per second max tracking speed Zero-acoustic Ultraslick mouse feet 17 MMO-optimized buttons (including 12 button thumb grid) Optional MMO-specific software Add Ons Unlimited character profiles with Add Ons Approximate Size: 116 mm / 4.57 (Length) x 70 mm / 2.76 (Width) x 46 mm / 1.81 (Height) Approximate Weight: 134 g / 0.30 lbs System Requirements PC / Mac with USB (Universal Serial Bus) port Windows 8/ Windows 7 / Windows Vista / Windows XP (32-bit)/ Mac OS X (v 10.6-10.7 & above) Internet connection (for driver installation) At least 35MB of hard disk space Razer Synapse 2.0 registration (requiring a valid e-mail), software download, license acceptance, & internet connection needed to activate full features of product & for software updates. After activation, full features are available in optional offline mode.