BOTAO Premium Material: The safety key is very important to keep any treadmill running efficiently. Round Treadmill Safety Keys are made of high quality ABS plastic, braided rope, strong magnets and springs that enhance their strength and security. Treadmill Safety Key: Magnetic work, can work easily and quickly on most treadmills that require a round treadmill safety key. It clips easily to any part of your clothes and has a firm grip. Clips easily to almost all types of clothing so you can forget your keys while walking or running. Solving Common Problems: If your treadmill cannot be turned on or the system power supply is inconsistent, it is usually due to a malfunction of the safety key. Our replacement security keys will solve these common treadmill problems at a fraction of the cost. Wide Compatibility: This universal treadmill safety key works with almost 99% of treadmills and is compatible with most top brands including Alliance, Pacemaster, Fitness Gear, Horizon, Bowflex, Landice, Lifespan, Livestrong, Merit, Pathfinder, Smooth, Sole, Sunny, Rhythm, Victory and Xterra. Due to size, we cannot guarantee that it will fit on all treadmills. How to use: You can connect the treadmill to the treadmill to start the treadmill, then remove the treadmill from the treadmill, and the treadmill will stop running. One end of the clip can be clipped to the corner of the garment. Quantity: (1-pack) Treadmill Safety Lock, other products not included Size: outer diameter 2.8 cm inner diameter 1.8 line length 1 meter (for reference only) Color as shown Note, because there may be color and size differences between the light effect photos and the actual product, please allow 1-2 cm error