Function Negative Ion Therapy Anions (negative ions) are typically found in the natural environment of the seashore, near waterfalls and in forests. Scientific studies have shown that negative ions can improve metabolism, relieve fatigue, and make you feel invigorated and refreshed. Air Pressure Massage Diversified air pressure massage modes simulate human's fingers massage. The comfortable massage in every direction can further boost blood circulation in the eye to alleviate eye tension and fatigue. Heat Therapy Tradition Chinese Medicine heat therapy helps to enhance blood circulation. Heat therapy for eyes can improve blood circulation in the eye, and relax the eye muscles immediately. Different temperature changes are available in heat therapy. Vibration Massage 15 Diversified vibration massage modes can make you enjoy the great relaxing experience in the eye and brain --LCD navigation menus in Chinese-English --Easy-to-use controller with beep signals --Ergonomical and streamlined design Technical parameters: Power supply: DC 6V Carton Size: 598*492*438 mm Packing: One unit to a color box with paper tray; N. W.: 1.0KG Qty/CTN: 20PCS G. W /carton: 20. 5KG