HXSJ T24 6 Buttons 2400 DPI 2.4G Wireless Vertical Ergonomic Mouse with USB Receiver 1. Vertical healthy mouse 2.4GHz Wireless Connectivity (USB receiver ) 2. Ergonomic designed to remit and prevent carpal tunnel syndrome 3. Optical laser technology for precise control 4. User convenience with wow-pen's signature, pen-grip comfort 5. LR mouse buttons, 2 thumb buttons, and a clickable scroll wheel , DPI button 6. You pick the hand position that best suits you, plug and play 7. Wireless Technology: 2.4G 8. Wireless distance: 10m 9. Optical resolution: 800DPI; 1600DPI; 2400DPI 10. Rated voltage current: 1.2V20mA 11. Number of keys: 6 keys 12. Button click life: 8 million times 13. Item size: 12.5cm x 6.5cm x 7.5cm 14. Material: ABS 15. System requirements: Windows 98 Me 2000 XP Vista Win 7 Win 8 10 Vista Mac OS or latest