The Microsoft Trackball Explorer 1.0 Mouse is a reliable and tested device that offers a unique trackball functionality for precise cursor control. With both PS/2 and USB connectivity options, this gray mouse from Microsoft is a versatile choice for users looking for a comfortable and efficient pointing device. Made in China, this trackball mouse is designed to work seamlessly with a variety of computers and systems, making it a practical and convenient option for anyone in need of a reliable pointing device.