Descriptions:Promote blood circulation, eliminate hematoma and inflammation, improve insufficiency.Convenient, comfortable , at home, lie down and you can easily use therapeutic equipment.In the treatment of cervical disease, relax and enjoy a pleasant feeling. Specifications:Pulses frequency: 0 Hz - 1000HzPulse width:20us -400usPower supply: 2 x AAA (not included)Material: plasticSize: 160*80mmColor: white & blackPackage included:1 x Cervical Vertebra Treatment InstrumentNotes:1.Due to the difference between different monitors,the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2.Due to the manual measurement and different measurement methods, please allow 1-3cm deviation.Thanks!