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 part of clothing and stays firmly in place, making it convenient to use with all types of attire. Durable ABS Construction: Made from sturdy ABS material, this treadmill security key is resistant to damage and designed for long-term use. Automatic Safety Device: The safety key serves 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: This treadmill safety key is designed for ease of use, offering peace of mind during exercise. Its convenience and automatic safety features make it an essential accessory.