You can comfortably warm your cervical spine anytime. This is a good product for relieving stiff necks. For overuse of the eyes, long hours of driving, inability to sleep, etc. * Two-stage temperature adjustment with one button Red: High temperature mode 55°C - 65°C Green: Low temperature mode 45°C - 55°C * Automatically turns off after 60 minutes * Rechargeable and cordless * Three-stage magnet adjustment * Comfortable fit with smooth material Rechargeable via USB, you can charge it from any outlet, computer, car power supply, etc. USB adapter is not included. Search for "Graphene Neck Hot Supporter" for a more detailed explanation. This is a used item, so please refrain from purchasing if you are overly concerned about its condition.