The Wireless Trackball Mouse EM04 by ProtoArc is an ergonomic Bluetooth rollerball mouse with a sleek gray ball design. It offers a maximum DPI of 1600 and features wireless connectivity for convenient use. The rechargeable mouse is lightweight, weighing only 0.57 pounds, and has a compact unit size of 5.87x4.69x2.99 inches. Its ergonomic design provides a comfortable and efficient user experience for navigating on your computer or tablet.