Feature: 1. Durable: This treadmill universal safety key is made of ABS plastic, which is strong and not easy to damage, and is suitable for long term use by runners. 2. Strong Clip: Treadmill key 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. Simple and convenient to use. 3. Treadmill Magnet Safety Key: Running machine safety lock, automatic protection, magnetic attraction, safe, compact, easy to use, sports equipment. 4. Safe: This lock is an automatic protection device for the treadmill. When the safety switch exceeds the sensing area of the treadmill, the running machine immediately stops working and emits a prompt tone to protect the user from falling and injuring during exercise. 5. Easy To Install: The treadmill safety key can run perfectly on most treadmills, small, lightweight and easy to install. Specification: Item Type: Treadmill Safety Key Material: ABS, Magnet Weight: Approx. 44g / 1.6oz. Package List: 2 x Treadmill Safety Key