Logitech MX ERGO 440DPI Bluetooth + Unifying Dual-mode Wireless Trackball Optical Mouse(Black) Feature: 1. With adjustable shaft. 2. Has cross-computer control capabilities. 3. Change the speed and accuracy of the cursor to achieve one-button control and adjust the sensitivity at will. 4. Quick access to shortcuts. 5. The battery can be used for up to 4 months after it is fully charged. 6. 320DPI-440DPI optical tracking technology. 7. Easy to install. Parameters: 1. Battery life: It can be used for up to 4 months after being fully charged (the battery power supply may vary depending on usage). 2. Battery: Rechargeable lithium-ion battery (500mAh). 3. Number of buttons: 8. 4. Wireless operating distance: about 10 meters. 5. Wireless technology: 2.4GHz wireless technology. 6. Requirements: Bluetooth. Windows 7810 or higher, Mac OS X 10.12 or higher. USB port. 7. Mouse size: about 132.5mm long, about 99.8mm wide, and about 51.4mm high. 8. Mouse weight: approx. 164g (without metal plate without receiver). 9. Receiver size: about 14.4mm long, about 18.4mm wide, and about 6.1mm high. 10. Receiver weight: approx. 2g.