Compatible with for hair dryers HD01 HD02 HD03 HD04 HD08 models. Installation: After power off, use tweezers or other slender tools to gently pry up the switch along the edge of the button to remove the residual glue; then pour an appropriate amount of glue into the hole. The glue can make your button stick more firmly to the body. Put the button into the hole and press it lightly for 5-10 seconds. 1 set contains 1 switch button, 1 cold air button, 1 wind button, and 1 hot air button. Different styles of buttons are suitable for different switch slots. Please note: When installing the button, please pay attention to the direction of the button. The protruding position of the button should be perpendicular to the handle of the hair dryer. Suitable for DIY repair and replacement of dropped or damaged buttons, highly compatible with the device. Colour:As Shown Material:Plastic Package Contents: 1set * Control Buttons Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.