a4tech rechargeable lithium ion battery pinpoint optic shuttle series wireless usb mouse (g11-570hx-4) by a4tech [並行輸入品] エイフォーテック long life, rechargeable lithium ion; charging status indicator, battery stops charging automatically when fully charged; operating range up to 15 meters; multi-link receiver connects up to 3 sets kbs/mice; dpi button: 5 adjustable 800-1000-1200-1600-2000 dpi; customizable shuttle key allows added functions; transmission: 2.4g; wireless range: 15m;