WORLD-CLASS CUSTOMER SERVICE: GYH is committed to miniaturization and home use of light therapy products, and provides you with world-class after-sales service. Each of our products can extend the warranty period to 560 days for free, and we provide a 146-day no-reason return and exchange service. At the same time, our technical team is ready to answer all your questions about products and technologies. Please feel free to contact us. Unique Patented Design - GYH LED mask has a patented unique Silicone eye mask support that protects your eyes. Adjustable chin pad for a variety of face shapes. These two unique designs keep the mask 1 cm away from the skin, so it is safer and cleaner to use. This also means that the light can not only cover the face perfectly, but also reach the neck skin. Built-in 2000 mAh high-performance battery, it can work continuously for 180 minutes on a full charge, completely free your hands. Professional clinical test: The clinical test results of the Korea Institute of Dermatological Sciences, a third-party organization, showed that after using the product for 4 weeks, Skin Compactness increased by 10.01%, Skin Moisture increased by 41.89%, Skin Roughness decreased by 8.29%, and Skin Redness decreased 3.25%, Skin Elasticity increased by 5.2%, and the overall satisfaction of 26 subjects was 96%. Professional light therapy technology: The parameters of our lamp beads are completely based on scientific research and clinical verification. The optical power density reaches 30mW/m² so as to deliver enough energy to the skin. The purity is as high as 98%, avoiding harmful light (such as UV) from harming your skin, and the wavelength error is as low as ±5nm, allowing the three lights to accurately reach the skin layer of its effect. So you can enjoy the professional light therapy spa at home. Near Infrared LED Mask: The red light (630nm), near-infrared (820nm) blue light (465nm) of the GYH LED Mask works at the cellular level to stimulate collagen and elastin production, beyond the reach of even the best serums and creams. Just wear the Korea GYH Beauty Mask for 10 minutes every day, you can restore the skin's lustre and elasticity, and wake up the perfect skin that is firm, supple, and translucent.