Product Material: Flannel Size: 19.5x10.5cm Control: Four-speed constant temperature Heating temperature: 35-50 degrees Celsius (normal temperature 20 degrees Celsius) Voltage: 5V Power supply: USB plug-in Color: Color Quantity: 1 Piece Package Contents: 1pcx Steam Eye Mask (battery not included) 1. Due to its size, the mask is great for relaxation, stress relief and headache relief. It can also be used as a simple sleeping mask. For that extra feel-good factor, there's an option to add a pleasing scent with an insert pad. To enhance aromatherapy, masks can provide low levels of moisture. 2. COMFORTABLE - Adjust easily with elastic straps, comfortable to wear and opaque. The curved shape adapts to different face shapes without creating any pressure points. 3. Individually Adjustable - Adjustable in 4 heat levels and 4 time intervals from 35 to 50 C. When the time is up, it will automatically shut down. 4. FLEXIBLE USE - The eyecup can be used comfortably on the go with a USB adapter on a PC or Laptop, power bank, car or other USB connection. You can take everything with you in the included carrying case. It's also more economical than single-use, disposable evaporative eye masks. 5. SOFT AND SAFE - The inside of the eye mask is made of soft and fluffy material, giving your eyes only the most gentle touch. Unlike traditional microwave goggles, this goggle was extensively tested during development to avoid the possibility of damage from overheating.