ERGO LINE – ERGO VERTICAL WIRELESS MOUSE DUAL CONNECTION MODE BLUETOOTH + USB-A 2.4 GHZDESIGN DESIGNED FOR OPTIMAL USE – KEEPS THE FOREARM VERTICALLY ALIGNED IN A NATURAL POSITION – COMFORTABLY PREVENTS FATIGUE AND PAIN RESULTING FROM PROLONGED USE OF TRADITIONAL MICE – 6 BUTTONS (INCLUDING NEXT/PREVIOUS/DPI 800/1200/1600) + CLICK WHEEL – LASER SENSOR – WORKS WITH 2 LR6 BATTERIES SUPPLIED – COL. BLACK