The Sperti Vitamin D Sunlamp, model D/UV-F, provides the special UVB rays that will generate Vitamin D naturally in your body. Our Vitamin D Lamp is the only FDA recognized ultraviolet product for Vitamin D production in the human body, and independent studies have verified it’s effectiveness. The portable Vitamin D Lamp is easy-to-use and a convenient way to get Vitamin D quickly and naturally. The Sperti Vitamin D Sunlamp features include. Adjustable timer for 1 – 5 minutes of use. Unit automatically shuts off when timer is finished. The bulbs are installed and ready-to-use. 4 special UVB bulbs with a 1000 hour bulb life. Built for dual voltage operations from 110-240 volts. No converter is required. Each box contains a US cord. Two pairs of UV blocking eyewear included with each sunlamp. Dimensions are 22? X 12? X 6? And weighs 14 lbs. In conformance with FDA sunlamp regulations. This product should not be used on individuals who have had skin cancer or have a family history of skin cancer. Individuals that are skin type I, highly sun sensitive people (those who always burn & never tan), should not use this ultraviolet device.