Fangrui Product Details 1. M030 4 Keys 1600dpi Laptop Office Mute Mouse, Style: Double Mode (gray) 2. Lightweight And Portable, Comfortable And Quiet 3. Ergonomics, Smooth And Round Shape, Not Tired After Long Time Use 4. The Mouse Button Adopts A Delicate Matte Surface Treatment Process, Which Makes The Hand Feel Comfortable 5. Automatic Sleep, Intelligent Power Saving Design 6. The Optical Engine Is Responsive, And The Control Is Smooth, And It Is Easy To Move Quickly And Accurately Locate Without Losing Frames 7. Interface: Usb 8. Material: Abs 9. Photoelectric Resolution: 1600dpi 10. Number Of Keys: 4 Keys 11. Working Method: Photoelectric 12. Operating Distance: 20 Meters 13. Wheel Direction: Two-way Wheel 14. Wireless Transmission Frequency: 2.4ghz 15. Battery Capacity: 500mah 16. Power Supply Mode: Usb Charging Built-in Lithium Battery 17. Working Power: About 0.6w 18. Working Voltage: 3.7v 19. Working Current: Less Than 15ma 20. Input Voltage: 5v 21. Input Current: 30ma 22. Input Power: 1.5w 23. Dimensions: 108 X 60 X 26mm 24. Weight: 60g