The extent of delivery is subjected to the first picture, the other images are the display effect Product Details: 1. Case: ABS plastic. 2. Buffer layer: empty plastic ring. 3. Surface: Shiny paint, matte paint. 4. Lens: transparent 5. Tax: One size; The size can be adjusted. Product size: 28 21 15 cm Strict selection of materials, do not fear collisions, environmental protection, high quality high quality technical plastics Security rear lights at the Mode, catchy personality, safe and elegant Tour of the head measurement: Take a tape measure parallel to the temple to a circle behind the forehead, the data obtained are the correct size (cm \/ cm ) necessary to buy a headset Be careful not to measure or top of the head [Note]: There is an error of 1 to 2 cm in the Manual measurement, and the product is submitted to the real product If you have no measurement tools, how to quickly know your head-turn? Use the wire elements around you (data cables, laces, packing boxes, etc.) as substitutes. Measure as shown in the figure, save and exit your identity card. The length of the identity card is 8.5 cm. It suffices to measure the engraved length of the substitute. Please allow a slight deviation in the measurement data and make sure it does not bother you before ordering. High quality store for you