Are you still worried about the safety of the treadmill ? When there are or elderly people , they are afraid that they will use the treadmill incorrectly. This product can help you solve this problem. This product can be given as a great present for your friends and families. They will be very happy. Made of plastic material, it is durable and use. You can safe to use it. Features - Color: Red. - Material: Plastic. - Size: 5.5x5.5x2.5cm. - This product can be given as a great present for your friends and families. They will be very happy. - Made of plastic material, it is durable and use. You can safe to use it. - This product can effectively ensure the safety of treadmill users, prompting people whether the treadmill is turned on. - With this , there is no need to worry about being injured on the treadmill. Because there is a protective lock. - This product is small and easy to carry. Simple to use, you can enjoy your exercise time. Package list: 1 Lock