Foxnovo 2.4GHz Wireless Folding Foldable Arc Optical Mouse with USB Receiver for PC Laptop MacBook (Black) Color: mainly black. Material: durable hard plastic and metal. Mouse folds on a strong metal hinge to 60% of its fully expanded size. Adopts advanced optical technology and superior sensor, to make it scroll easily in any direction, and provide smoother and more precise control experience. provide smoother and more precise control experience. Ergonomic arc mouse design fits your palm perfectly, for easy and comfortable to grip and operate.