Use: This portable electric heating pad device uses USB to charge, which is more convenient. It has three different adjustable temperatures and three different high-frequency vibration frequencies, you can choose the mode according to your needs. Automatic design: The portable heating pad is designed to automatically shut down. If you fall asleep during use, our product will automatically shut down within 30 minutes of detecting that you have no action to ensure your safety and health. If you want to use it again, just open it again. Portable: small footprint, easy to carry, and can be used at any time. Note: This thermal pad can efficiently and quickly generate heat. So please select the lowest level when you use it for the first time. More importantly, don't let the skin touch the device directly. Please place a cloth between the device and the skin. Application: You can use our products in different scenarios, whether you are resting, reading, driving or working, it will not have much impact on you. Washable design, not easy to deform. 3 levels of temperature can be adjusted, which can be adjusted as required. Take care of your health, improve cold hands and feet, and relieve menstrual cramps.