This revolutionary, computer-friendly, salt crystal lamp plugs safely and securely into the USB port on your computer. Whilst your computer is on, this lamp reduces electro-magnetic pollution to ionize and balance the air. The negative ions generated counteract the radiation emitted by the computer and monitor, which in today's office environment causes fatigue, sickness and disease. With its positive properties of improving health and well-being, the Micro Salt Crystal Lamp with USB will help clear the mind and aid concentration. It makes an attractive addition to any work space.