Portable electronic neck massager Restore normal physiological structure of cervical achieve traction effect AM Help eliminate edema, inflammation, promotes your blood circulation,and relaxes your muscles Have released the pain caused by nerve compression Improve sleep, enhance the effect of the depth of sleep Easy to take on and use With neck massager, relieving the tension of your neck muscle Powered by 2 x AAA batteries ( Battery not included) Color : as shown in the picture Net Weight: 186 g / 6.56 oz Size: 200 x 163 x 72mm / 7.87 x 6.42 x 2.83 inch