NIUNIU Use: 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, you can choose the mode according to your needs. Automatic Design: Portable heating pads are designed to turn off automatically. If you fall asleep during use, our product will automatically shut down within 30 minutes after detecting your inactivity to ensure your safety and health. If you want touse it again, just turn it on again. Portable: Small footprint, easy to carry, and ready to use. NOTE: This thermal pad produces heat efficiently and quickly. So please choose the lowest level when using it for the first time. More importantly, don't let your skin come into direct contact with the device. Please place a cloth between the device andyour skin. Application: You can use our products in different scenarios, whether you are resting, reading, driving or working, it will not affect you too much. Washable design, not easy to deform. 3 temperature adjustable, can be adjusted according to needs. Take care of your health, improve cold hands and feet, and relieve dysmenorrhea.