Logitech Ergo M575S Wireless Bluetooth Trackball Mouse (Black/Blue) *No Dongle* - Open box, works great.The Logitech Ergo M575S Wireless Bluetooth Trackball Mouse in Black/Blue is a versatile and ergonomic mouse designed for comfortable use. With a trackball for precise optical tracking and 5 buttons, this mouse offers a unique and efficient user experience. Logitech's reputation for quality ensures a reliable and high-performing product, while the wireless connectivity via Bluetooth makes it easy to use on a variety of devices. With a maximum DPI of 2000 and ergonomic design, this trackball mouse is a practical choice for users looking for precision and comfort in their mouse.