features 1Automatic Protection: The safety lock is an automatic protection device f the treadmill. When the switch is out of the treadmill sensing area, the running opptunity immediately stops wking emits a beep to prevent from falling during the exercise. 2Applications: Magnetic suction safety switch f electric treadmills is suitable f electric treadmills with rounded magnetic switches. 3Easy to Use: It is compact, easy to use, easy to install. When used, the safety lock is placed in the grooved place of panel the other end is clipped on the clothes, which is convenient to operate. 4Durable Materials: Safety keys are extremely imptant to maintain the efficient operation of any treadmill. The round treadmill safety key is made of premium ABS magnets, which enhances their strength safety. 5Lightweigt Ptable: This treadmill emergency stop device is lightweight ptable. You can take it with you when you need to go out f exercise.SpecificationItem Type: Treadmill Safety SwitchMaterial: ABS, magnetGross Weight: 31g or 1.1ozProduct Size: Rope length: 92cm or 36.2in, magnet shell diameter: 32mm or 1.3in, height: 28mm or 1.1in, magnet diameter 9mm or 0.4inDiameter of a single column: 2mm or 0.1in, distance between two columns: 20mm or 0.8in(The rope is slightly elastic, manual measurement allows err, does not affect the use) .wang-edit-text{ font-family:'Arial' imptant; } .wang-edit-text table { bder-top: 1px solid 000; bder-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { bder-bottom: 1px solid 000; bder-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List2 x Emergency Stop SwitchNote1. Due to manual measurement, please allow 0and 8209;1cm err. Make sure you don't mind befe bidding.2. Due to the difference of different monits, the picture may not reflect the actual col of the item. Thanks