Logitech ERGO M575 Creative Wireless Trackball Mouse (Black)

1. Ergonomic design fits the shape of the hand no need to move the arm around to move the cursor which can effectively reduce the fatigue of the hand and arm 2. Smooth and sensitive thumb control is convenient and easy to use no need to move very suitable for compact desk space 3. There are two connection methods both Bluetooth and USB receiver can be connected 4. The trackball can be easily removed and wiped to achieve a cleaning effect 5. DPI: 400-2000DPI 6. Number of keys: 5 7. Wireless operating range: about 10 meters 8. Battery life: USB receiver connection: 24 months Bluetooth connection: 20 months 9. Battery: 1 AA battery (not included) 10. Mouse size: about 134x100x48mm receiver size: 18.7x14.4x6.1mm