Specifictaion:Material: PlasticMachine size: 150 x 60 x 15mm Power Adapter: input AC 100-240V Power Supply: 3 x 1.5V AAA batteries ( Batteries not Included in package) or Power Adapter (Not Included in package).Cover color: Silver、 yellow、 pink、 orange and purple are optional.Packing list:1 x Meridian Machine 4 x Electrode adhering tips and pads 1 x White USB charging cable (it connect main machine with pads、 not power adapter.)It is an ideal product suitable for who have stiff shoulder、 end neural paralysis、 neuralgia、 shank ache、 whole body fatigue、 stomachache、 bad cold、 cervical vertebra neck ache、 per arthritis、 toothache、 high blood pressure、 low blood pressure、 energy failure、 week sexual ability、 irregular menstruation、 various acute chronic diseases. Digital display the strength、 mode、 function、 treatment time and body meridian chart. Based on Chinese medicine.