Waterless graphene rechargeable hand warmer

The product is heated by graphene, warm but not hot. It is safe and healthy compared to other heaters on the market and is powered by USB plug-in heating, not water-filled and rechargeable.2. Constant temperature model and 3 levels of temperature regulation (40/50/60 degrees Celsius) are available, one minute quick heating3. Lightweight and foldable, can be taken on the plane, travel with you4. Automatic power-off for 90 minutes of heating, for greater safety5. Separate water and electricity design, can be washed at will6. Rated power: 10W7. Rated voltage: 5V8. Size: 30 x 19 cm9. Weight: 82g