Vertical streamlined design, combined with ergonomics, naturally fits the palm of the hand, reducing the discomfort of long-term use of the mouse The forward and back buttons below the left thumb of the mouse speed up navigation and help you navigate easily 800-1200-1600 DPI Free adjustment, one button to meet your different needs Applicable battery: 2 7th batteries (not included, 6 months long standby, avoid frequent battery replacement problems