The Pain Relief Laser treatment is sensation free & is takes only a few minutes to use. The device is compact & handy so that you can carry it around with you for daily use. Treatments with this product promote the bodies normal healing process when used on specific areas of pain by activating normal inter-cellular radiation. The photons produced by the laser light help any abnormal tissue to function normally by activating enzymes within the cells. When activated enzymes within a cell trigger a natural chemical reaction in which more enzymes are activated in a domino-type effect, helping relief pain & more importantly start the natural process. The Pain Relief Laser is powered by 2 x AAA batteries which are included & comes with a 1 year warranty, along with Tower Health's 30 day Money back guarantee.