The ProtoArc Wireless Bluetooth Trackball Mouse (EM03 NL) is a sleek and ergonomic rollerball mouse designed for comfort and precision. With a maximum DPI of 1600 and optical tracking method, this black mouse offers a smooth and accurate cursor movement. Its wireless connectivity via Bluetooth ensures convenient use without the hassle of cords. The 4-button design and ergonomic features make it a great choice for users looking for a reliable and efficient trackball mouse.