Usage Tips:1Universal Compatibility: This safety key is compatible with most treadmills that require a round shaped treadmill key. Such as, fit for ICON; Fit for JOHNSON; Fit for Yijian; Fit for JUNXIA; Fit for Decathlon; Fit for AD. 2Secure Clip: The key features a secure clip that can easily attach to any part of clothing and stays firmly in place. It can easily clip onto all types of attire, making it simple and convenient to use. 3Durable ABS Construction: This treadmill security key is made of sturdy ABS material, ensuring it is resistant to damage and suitable for long term use by runners. 4Automatic Safety Device: The safety key acts as an automatic protection mechanism for the treadmill. When the safety switch is outside the treadmill's sensing area, the treadmill immediately stops functioning and emits a warning sound. 5User Friendly: The treadmill safety key is designed to be user friendly, providing peace of mind during workout sessions. Its convenience and automatic safety features make it an essential accessory.