Adjustable Brightness, high and low.Touching switch.Use 30 to 60 minutes a day to help boost your mood, increase concentration and restore energy.Natural light therapy can be used to prevent winter depression and eliminate bad mood.Fine workmanship and good performance.Convenient to use.Long service life.Specifications:Brand newMaterial: ABS (Acrylonitrile Butadiene Styrene) + Optical grade light guide lensSize: approx. 140*144mm/ 5.51*5.67"Voltage: DC 5V, 1APower: 5WLight Intensity: 6000/ 10000Lux in 10cmLED Quantity: 60csScope of Application: sunlight, improve mood and increase energy.Ultraviolet Radiation: No