1. Use Broadcom 2042 Chipset with wireless Bluetooth 2.0 interface 2. Use Agilent's 5030 optical IC, with 1000DPI optical resolution as minimum 3. Features comfortable, ergonomic design 4. Unique super energy saving mode, battery life longer than similar products by 50% to a maximum period of 12 months 5. Come with particular power managing software, indicates the power capacity in Microsoft Windows System automatically 6. Use the Bluetooth industry leading software solutions, WIDCOMM BTW (Microsoft officially designated software) Bluetooth software 7. Built-in software solutions with Bluetooth human interface device and comply with the standard version of the Bluetooth SIG Bluetooth 2.0 8. Work with Windows 98, ME, 2000, Server 2003, XP and Vista 9. AAA alkaline battery x2 10. Frequency band: 2.4 - 2.4835GHz unlicensed ISM band 11. Receiving sensitivity: -75bm (standard) 12. RF output power: up to 4bm as maximum, good for your health with lowest radiates 13. Operation distance: 10m 14. Operating temperature: -10~55 15. Workable environment: 0-55 16. Humidity: 20%-50%