1.Air pressure music massager makes you feel more comfortable. 2.The massage contacts is made of premium rubber and shape of nail, which is soft, so you can feel more comfortable when you using. 3.The shell is made of ABS, which is wear-resisting and not easy to be dirty. 4.Two ways for charging: -Power outlet -Four sections AA battery (It does not include when shipping.) 5.Method of application: -Wear feel free According to your head size, you can adjust the distance between the top and both sides to a suitable state and then put the massager on your head. At the same time, you should adjust the degree of light shade of the top and then adjust the top distance suitably. Using the rotary button of the side to adjust: (1) The biggest inside diameter: 68cm The smallest: 54cm (2) The biggest outside diameter: 77cm The smallest: 69cm Suitable head size: 54-68cmSpecification: Package Weight One Package Weight 1.76kgs / 3.89lb One Package Size 28cm * 25cm * 30cm / 11.02inch * 9.84inch * 11.81inch Qty per Carton 10 Carton Weight 17.44kgs / 38.45lb Carton Size 82cm * 44cm * 62cm / 32.28inch * 17.32inch * 24.41inch Loading Container 20GP: 119 cartons * 10 pcs = 1190 pcs40HQ: 276 cartons * 10 pcs = 2760 pcs