Universal Compatibility: This safety key is compatible with most treadmills that require a round-shaped treadmill key, including models from ICON, JOHNSON, Yijian, JUNXIA, Decathlon, and AD. Secure Clip: The key features a secure clip that easily attaches to any clothing and stays firmly in place, making it convenient for all types of attire. Durable ABS Construction: Made from sturdy ABS material, this treadmill security key is resistant to damage and built for long-term use. Automatic Safety Device: Acts as an automatic protection mechanism; when the safety switch moves out of the treadmill's sensing area, the treadmill immediately stops and emits a warning sound. User-Friendly Design: Designed for ease of use, this safety key provides peace of mind during workouts with its reliable and convenient safety features.