features 1Automatic Protection: The safety lock is an automatic protection device for the treadmill. When the switch is out of the treadmill sensing area, the running opportunity immediately stops working and emits a beep to prevent from falling during the exercise. 2Applications: Magnetic suction safety switch for electric treadmills is suitable for electric treadmills with rounded magnetic switches. 3Easy to Use: It is compact, easy to use, and easy to install. When used, the safety lock is placed in the grooved place of panel and the other end is clipped on the clothes, which is convenient to operate. 4Durable Materials: Safety keys are extremely important to maintain the efficient operation of any treadmill. The round treadmill safety key is made of premium ABS and magnets, which enhances their strength and safety. 5Lightweigt and Portable: This treadmill emergency stop device is lightweight and portable. You can take it with you when you need to go out for exercise.SpecificationItem Type: Treadmill Safety SwitchMaterial: ABS, magnetGross Weight: 31g / 1.1ozProduct Size: Rope length: 92cm / 36.2in, magnet shell diameter: 32mm / 1.3in, height: 28mm / 1.1in, magnet diameter 9mm / 0.4inDiameter of a single column: 2mm / 0.1in, distance between two columns: 20mm / 0.8in(The rope is slightly elastic, manual measurement allows error, does not affect the use)