ship from Japan High Speed Scroll Function] In addition to the standard wheel and horizontal scroll functions, a high speed scroll function is provided. Ratchet mode is also provided for precise navigation. Design for Comfortable UseThe design allows you to operate the buttons easily and place your hands and fingers in a natural position for easy operation. 7 buttons, including side buttons, can be customized. Mouse body size (W x D x H)mm: 71 x 109 x 42 Battery: AA size dry cell x 2 pcs, Battery life: Max 3 years *Depends on usage environment and conditions. Warranty Information: Operating distance: Approx. 10m2, Reading method: Optical Color: Charcoal Wireless System: Advanced 2.4GHz Wireless Technology (Unifying)