SIZE： 直径7cm, 高4.5cm MEAS： 51X27.5X50CM 100PCS/CTN GW： 10.2 KGS NW： 9.5KGS Support OS:LBM PC/MAC; Plug&play function,convinient using and carry; Delicated designed,exquisite appearance,especially agree office using,also can meet desk computer by extend line; The product can be working out by hand and more efficiency to install between your body and the seat.The product only for massage purpose not medical treatment.No USB elctricity wastage when if not working.Best choice for releasing fatigue eyes and laxity the strained nerve. Various colour selection; Flowery and individual LOGO can be designed 23*18cm,suppliers and distributors can choose it as promoting and advertising gifts; Considerate design,no national bunderies propagandization,wonderful promotion gift