Protection:
This emergency shut-off key is designed to protect the runners safety when using the treadmill. If you accidentally fall while running, the key will be pulled off and make the treadmill stops running.
Universal:
Compatible with a wide variety of treadmill that needs a magnet key. If your treadmill key is lost or broken, it would be a good replacement.
Note:
It can easily clamp and hold to any part of your clothing. Please check the size before buying to avoid being unsuitable for your treadmill.