Specification: 1. Brand: Rapoo 2. Model: M550 3. Color: Black 4. Connection:Bluetooth 3.0, Bluetooth 4.0, 2.4GHz Wireless 5. Tracking Method: Optical 6. Key Travel: 0.6mm 7. Acceleration: 10G 8. Resolution: 1300DPI 9. Button:Left Button, Right Button, Scroll Wheel, Bluetooth Switch Mode 10.Tracking Rate: 30inch/s 11. Voltage: 1.5V 12. Current: 50mA 13. Power: 2 * AAA Battery(Not Included.) Features: 1. Multi-mode connection, you can switch the connction mode among Bluetooth 3.0, 4.0 and 2.4GHz Wireless mode. 2. Can simultaneously connect to up to 3 devices, and be switched among them with ease. 3. 1300dpi for accurate tracking, suits for office daily use. 4. Matte surface, skid-resistance and sweat-resistance. 5. The mousehasstrongadaptivesurfaceability, which could workfine at multiple material surface, such as resin, leather, wood, paper and so on. 5. Silent switch reduce the click noise. Note: Because of the restriction of the transportation, we will take out the battery. Package Included: 1 *Rapoo M550 Ultra-thin Multi Mode Bluetooth 3.0/4.0 2.4GHz Wireless Mouse Silent Mouse For Office Use