Usage: This portable electric heating pad device uses USB charging, which is more convenient. It has three different adjustable temperatures and three different high-frequency vibration frequencies, and you can choose the mode according to your needs. AUTOMATIC DESIGN: The portable heating pad is designed to turn off automatically. If you fall asleep during use, our product will automatically shut down within 30 minutes after detecting no movement on your part to ensure your safety and health. If you want to use it again, just open it again. Portable: It occupies a small area, is easy to carry and can be used at any time. NOTE: This thermal pad generates heat efficiently and quickly. So please choose the lowest level when using it for the first time. What's more, don't let your skin come into direct contact with the device. Please place a piece of cloth between the device and your 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. The temperature is adjustable in 3 levels and can be adjusted as needed. Take care of your health, improve cold hands and feet, and relieve menstrual pain.