NIUNIU Product description Material: velvet Size: 19.5*10.5cm Control: four-speed constant temperature Heating temperature: 35-50 degrees Celsius (room temperature 20 degrees Celsius) Voltage: 5V Power supply: USB plug Color: purple, gray Quantity: 1 piece Package Contents: 1pc* Steam Eye Mask (Battery Not Included) 1. PURE RELAXATION - Due to its size, face masks are great for relaxing, reducing stress and relieving headaches. It can also be used as a simple sleeping mask. For that extra feel-good factor, insert pads are optional to add a pleasant scent. To enhancethe aromatherapy effect, a mask with a low moisture content can be added to the mask. 2. COMFORTABLE - Easily adjustable with the elastic band for a comfortable and opaque fit. The curved shape adapts to different face shapes without causing any pressure points. 3. Individually adjustable - adjustable in 4 temperature levels from 35 to 50 degrees Celsius and 4 time intervals. It will automatically turn off when the time is up. 4. FLEXIBLE USE - This eye mask can be comfortably used on the go with a USB adapter on your PC/Laptop, power bank, car or other USB connections. You can take everything with you in the included carrying case. It's also more economical than single-use,disposable vaporizing eye masks. 5. SOFT AND SAFE - The inside of the eye mask is made of soft and fluffy material, allowing only the gentlest touch for your eyes. Unlike traditional microwave eye masks, this mask was extensively tested during development to avoid the possibility ofdamage due to overheating.