90% reduction on clicking noise: Enjoy the sound of silence with maximum quiet when clicking the left or right button on this silent mouse, with no driver installation required for use Enhanced optical tracking: Provides high-performance precision and smart cursor control on any surface Built for long sessions: Fine choice for gamers and any user who works long periods on the computer, providing total comfort with a quiet scroll wheel and advanced ergonomic design Auto-sleep function: This wireless mouse enters into power-saving mode after 15 minutes idle, with the left or right button quickly activating the mouse when you\'re ready to resume work 24 months warranty: For a worry-free user experience that ensures long-lasting performance Technical Details Brand - Logitech Item Weight - 91 g Product Dimensions - 3. 8 x 6. 8 x 10. 5 cm Batteries - 1 AA batteries required. (included) Item model number - 910-004909 Series - M330 SILENT PLUS Color - Black Form Factor - Right-hand Processor - Count 1 Computer Memory Type - DDR3 SDRAM Power Source - Batteries Software Included - Mac OS X 10. 9 Mavericks Battery Type - AA