1. Mouse size: 111 x 62 x 38 mm 2. Resolution: 800DPI 3. Unique design for people fond of serfing online, especially for notebook users. 4. Dont need microphone or speaker when chatting on internet, or listening to music, digital audio computers. 5. Freely walk around the room as you like, when using this mouse within 5 or 7 meters. 6. If you are worried to disturb other people around or you''''d like to enjoy privacy, you can switch the audio output to a wireless headphone. 7. Buttons: 3 buttons with scroll wheel, and 1 frequency ing button at the base of the mouse 8. Fashionable stainless steel strip in the middle of mouse surface 9. FM frequencies: 88.1, 88.3, 88.9 & 89.1 MHz available 10. FM transmitting effective range: 5 meters, 360 degrees 11. Audio input effective range: 5 meters, 360 degrees 12. Speaker in mouse: 0.5W, mono 13. FM wireless headset: Headset dependent Headset provided: 30Hz-15, 000Hz 14. Headset provided: Stereo 15. Buttons life: Over 3, 000, 000 times 16. Freely zooming in/out functions 17. Package includes wired optical 18. Unique design for comfortable touch, with a wide U wheel 19. Be able to work on any surface except glass 20. Compatibility: Win/98/2000/ME/XP