Treadmill Safety Key: The safety lock is an automatic protection device for the treadmill. Material: Made of high quality ABS, durable for a long time. Portable: Lightweight treadmill safety key, easy to use. Design: The safety lock is placed in the groove of the panel and the other end is clipped on the clothes, which is convenient to operate. Wide Compatible: This treadmill safety key is suitable for almost treadmills. Round plug for Decathlon; Rectangle plug for AD; Magnetic plug for Tempo. Specification: Material: ABS Size Chart: Round: 3.2cmx3.9cm/1.26inchx1.54inch Rectangle: 4.6cmx2.8cm/1.81inchx1.10inch Magnetic: 4cmx2.3cm/1.57inchx0.91inch Package Includes: 1 Treadmill Safety Key Note: Please allow slightly errors due to manual measurement and different monitors.