Rapoo M550 1300DPI 3 Keys Home Office Wireless Bluetooth Silent Mouse, Colour: Ordinary Version Black 1. Wireless charging 2. Connect multiple terminal devices for efficient office work 3. CNC process aluminum alloy roller 4. 1300DPI tracking engine, responsive, smooth operation, accurate tracking 5. Silent micro-movement, effectively reducing the use of noise 6. Sensing distance: 8mm 7. Photoelectric resolution: 1300dpi 8. Acceleration: 10G 9. Charging power: 10w 7.5w 5w 10. Working method: photoelectric 11. Working current: 50mA 12. Battery capacity: 320mah 13. Charging time: about 2-3 hours 14. Power supply mode: Normal version: 1 AA battery (need to purchase by yourself) 15. Key stroke: 0.6mm 16. Transmission mode: wireless 2.4G, Bluetooth 3.0, Bluetooth 4.0 17. Tracking speed: 30inchs 18. Buttons: left button, middle button, right button, Bluetooth button 19. Weight: about 60g 20. Size: about 6x10.3x2.3cm 21. Note: The product only contains a mouse, not a charging device