2PCS Universal Treadmill Magnetic Lock Treadmill Emergency Stop Switch Wire Clip Lock Start Key 1Strong And Durable: This fitness magnet key is made of excellent ABS and magnet material, which is sturdy and not easy to be damaged, suitable for runners to use for a long period of time. 2Strong Clip: This treadmill magnetic lock comes with a strong clip that can be easily clipped to any part of your clothing, making it both easy and convenient to use. 3Easy To Install: This treadmill magnet security lock is small in size and light in weight, which makes it very easy to install and replace. 4Easy To Use: This treadmill safety key is very easy to use, when the safety switch is beyond the sensing area of the treadmill, the treadmill will stop working immediately and emit a beep sound to protect the user from falling and getting hurt during the exercise process 5Wide Application: This ABS universal treadmill magnetic lock has a wide range of applications and can be used at home, gym, etc, which is very practical.