Features: 1Durable: This treadmill key is made of ABS plastic, which is strong and not easy to damage, and is suitable for long term use by runners. 2Firm Clip: It can be easily clipped to any part of the clothes, and it is very firm. It can be easily clipped to almost all types of clothes, and it is simple and convenient to use. 3Magnetic Attraction: Running machine safety lock, automatic protection, magnetic attraction, safe, compact, easy to use, sports equipment. 4Automatic Protection Device: This lock is an automatic protection device for the treadmill. When the safety switch exceeds the sensing area of the treadmill, the running opportunity immediately stops working and emits a prompt tone to protect the user from falling and injuring during exercise. 5Easy To Install: The treadmill safety key can run perfectly on most treadmills that require a round treadmill key, small, lightweight and easy to install. Item Type: Treadmill Safety Key Material: ABS, Magnet Color: Red Weight: Approx. 38g / 1.3oz Product Size: Approx. 15x40mm / 0.6x1.6in Package Included: 2 x Treadmill Safety Key