About the product:This warning board is mainly installed on the button switch to play the role of reminder. It is widely applied in emergency stop equipment at home and most public places.Good Choice for you:1. Ring mounting hole design, more suitable for fitting on push buttons.2. The emergency stop warning sign has a very stable structure and can be waterproof, heat-resistant, insulating and heat-resistant.Easy to install: The installation method is very convenient and does not take up too much time.Tips: Please check the specifications before purchasing.