1Automatic Protection Device: When the safety switch leaves the sensing area of the treadmill, the treadmill stops working immediately and emits a sound to prevent the user from falling and being injured during exercise.2Features: Treadmill safety lock, automatic protection, magnetic suction, safe, compact, easy to use, easy to install, easy to operate, sports equipment.3Power Clip: Lightweight, easy to use and easy to install. When in use, the safety lock is placed in the panel groove, which can be easily clipped to clothing, easy to operate and durable.4Universal Fitness Accessories: Magnetic suction safety switch, safe treadmill key, extremely important to keep any treadmill exercise running efficiently.5Dimensions: Rope length is about 93cm/36.6in, magnet shell diameter is 32mm/12.6in, magnet diameter is 15mm/5.9in.2 x Treadmill Safety Key