describe:1. Function: heating, preheating gear + three (high, middle and low) three gears2. Voltage parameter: 5V/2A power: 5w3. Temperature control: 38-454. Product accessories: eye mask x1, control line x1, manual x1, spray bottle x1, flannel bag x15.Size: 67x8.5cm6.Weight: 170g7. Color: blue, pinkFeatures:1. Inlaid with tourmaline energy tablets, which act on the eye acupoints, wear for a long time, and change eyestrain2. Graphene is used as the heating material, which is light and thin, high in hardness, and strong in toughness3. The temperature control system is formulated according to the appropriate text and picture changes of the human sleep circadian rhythm4. Selected shading fabrics, comfortable, soft and elastic5. The intimate arc angle design of the nose part of the eye mask, does not press the eyes and the nose, and enhances the shading effect6.USB charging, can be charged in a variety of plug-in methods7. Three-speed temperature adjustment, one-key shortcut operation8. It is not easy to be deformed after washing, and it can be used repeatedly to protect the eyes for a long time.9.Small and portable, can be carried with you10. Elastic elastic band, can freely adjust the length, reduce bud pain