Material: This treadmill speed sensor is made of plastic, ensuring durability and long-term use. Compatibility: The product includes a 3-pin optical speed sensor or a 2-pin magnetic speed sensor (OPTIONAL), making it suitable for various treadmill models. Functionality: It serves as an essential component of the treadmill that helps accurately measure speed during running or walking. Easy Installation: This treadmill accessory is easy to install, allowing users to replace old or damaged parts without professional assistance. Reliable Performance: With high sensitivity and precision, this treadmill speed sensor ensures consistent and reliable performance for your workouts. Size: 3-pin optical speed sensor: 31 cm (12.20 inches) Package Includes: 1 x 3-pin treadmill optical speed sensor Note: Please allow slight variations due to manual measurement and differences in display screens.