The switch button is an accessory to ensure the quality. Suitable for dyson HD01 HD02 HD03 hair dryer 110V/220V can be in common use It will have slight scratches caused by transportation,please kindly know.Best wishes! Installation: need professional tools to install,please kindly know. Colour:black Material:plastic Package Contents: 1 Set x switches (with buttons) Only the above package content, other products are not included. Note: Light shooting 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.