1. Lightweight and portable, comfortable and quiet2. Ergonomics, smooth and round shape, not tired after long time use3. The mouse button adopts a delicate matte surface treatment process, which makes the hand feel comfortable4. Automatic sleep, intelligent power saving design5. The optical engine is responsive, and the control is smooth, and it is easy to move quickly and accurately locate without losing frames6. Interface: USB7. Material: ABS8. Photoelectric resolution: 1600dpi9. Number of keys: 4 keys10. Working method: photoelectric11. Operating distance: 20 meters12. Wheel direction: two-way wheel13. Wireless transmission frequency: 2.4GHz14. Battery capacity: 500mah15. Power supply mode: USB charging / built-in lithium battery16. Working power: about 0.6w17. Working voltage: 3.7v18. Working current: less than 15mA19. Input voltage: 5v20. Input current: 30mA21. Input power: 1.5w22. Dimensions: 108 x 60 x 26mm23. Weight: 60g

http://olla.gr/m030-4-keys-1600dpi-laptop-office-mute-mouse-style-wireless-gray/