- Magnetic design provides reliable, stable operation on treadmills that require a round safety key. - Automatic protection stops the treadmill immediately when the safety key moves out of the detection range. - Easy to use: attaches to clothing so you can run or walk without carrying a loose key. - High-strength construction delivers durability and safety, essential for ongoing treadmill operation. - Compatibility: fits most treadmills that require a round safety key. - Practical use scenarios: - Home workouts: use as a spare or replacement key to quickly restore safe treadmill use if your original key is lost or damaged. - Shared gym machines: keep on your clothing for fast setup on any round-key treadmill with minimal downtime. - Trainer or rehabilitation sessions: convenient backup key for clients during workouts to maintain safety and continuity.