2PCS Universal Treadmill Safety Keys Security Magnet Lock Emergency Stop Switch for Running Machine1Main Function: When the safety switch exceeds the sensing area of the running machine, the treadmill immediately stops working and emits a warning sound. 2With Sturdy Clip: This treadmill key is equipped with sturdy clip that can be held in any position on all types of clothing, making it convenient and practical. 3ABS Plastic: The treadmill safety lock shell is made of excellent ABS plastic, which has good toughness, wear resistance, and is suitable for long term use. 4Good Compatibility: This emergency stop switch lock is suitable for most running machine, with good compatibility, compact and lightweight, easy to use and carry. 5Safe Protection: The treadmill emergency stop switch provides good protection to prevent users from falling and getting injured during fitness and exercise.