Automatic Protection: The safety lock serves as an automatic protection device for the treadmill. When the switch moves out of the treadmill's sensing area, the treadmill immediately stops and emits an ble alert to help prevent accidents during use. Applications: This magnetic safety switch is designed for electric treadmills that use round magnetic switches. Easy to Use: Compact and simple to install, the safety lock attaches to the treadmill's designated slot while the other end clips securely to clothing for convenient operation. Durable Materials: Safety keys play a crucial role in treadmill operation. This round safety key is constructed from high-quality ABS plastic and integrated magnets to ensure durability and reliable performance. Lightweight and Portable: This emergency stop device is lightweight and easy to carry, making it convenient for travel or use at different locations. 2 x Emergency Stop Switch