Product material: ABS, Silicone Battery capacity: 1000MAH Maximum power: 5W as comfortable as a hot towel: Neck Massager Built-in new thermostat, 107 degrees Fahrenheit warmth penetrates the neck skin, deeply relaxes the neck muscles. The effect of cervical spine massage is remarkable: the pulse electric frequency of the cervical spine massager is transmitted to the deep layer of the skin, simulating a variety of simulated massages to achieve deep relaxation of the cervical spine. Intensity level for neck pain relief: Press and hold the button for a few seconds to activate the massage mode, easy to operate. The skin-friendly, breathable soft silicone material makes the carotid artery stress-free. U-shaped neck circumference is more suitable for different people's neck size and neck curve. Safe to use: This neck massager uses low frequency electric pulse therapy. It is forbidden to implant a pacemaker in the body or do not use it when carrying metal. It is normal to feel electric shock when you use it for the first time. Long-term use is better. Note: Actual colors may differ slightly from the image due to different monitors and lighting effects.