The Grohe Temperature Control Handle Safety Button is a safety feature that helps keep you safe when using the handle. The button is located on the side of the handle and is easy to access. When you need to use the handle, just press the button and it will automatically open. The Grohe Temperature Control Handle Safety Button is a safety feature that helps keep you safe when using the handle. The button is located on the side of the handle and is easy to access. When you need to use the handle, just press the button and it will automatically open.