gigabyte precise optical tracking system 9 month battery life enlarged scroll wheel and mouse feet comfortable grip for both hands stylish glossy coating interface usb 24ghz wireless tracking system optical sensitivity 1000 dpi dpi switch na scrolling std vertical side buttons na dimension l 99 x w 59 x h 35 mm weight 60g excluding batteries transmission distance 68m in open site battery life 9 months color black packing cont