Need more than 1? The Vertical Mouse Will Help To Reduce The Pressure And Pain Caused By The Mouse On The Wrist. Ergonomically Designed, Long-Term Use With Comfortable Palm Feeling, Relieving Tired. 6 Buttons, Including Left/Right Button, Dpi Button, Forward/Backwards Button And Scroller Button. Compact And Lightweight, Easy To Carry. Made Of Abs Material, The Surface Is Rubber, It Is Comfortable. The Left Mouse Light Bar Will Show Red At Work Specifications: Item Type: Wireless Mouse Material: Plastic Color: Black Work: Laser Connection: Wireless Number Of Keys: 6 (With 3D Scroll Wheel) Buttons: Left/Right Button, Dpi Button, Forward/Backwards Button, Roller Button Tracking Systems: Optical Dpi: 800-1200-1600 Ergonomics: The Right Hand Design Mouse Power Supply: Built-In Lithium Battery (Charging By Usb Cable) Breathing Light: Led Red System Support: Window Vista, Window Xp, Window 7/8, Or Higher SpecificationGeneral Type: Mouse Material: Abs Features: Novelty Usage: Gaming Mouse Type: Vertical,Ergonomic Color: Black Product Details Connection: Wireless Connection Type: Bluetooth