More concentrated energy: The portable anti-bite device has strong penetrating ability and is suitable for physiotherapy in small areas and concentrated areas. Lightweight: This portable anti-bite device is small in size, easy to store and carry, and can be easily put in a bag, suitable for travel. Near-infrared light: The instrument can penetrate deep into the skin and reach the point of discomfort more effectively to relieve discomfort. Shorten treatment time: The portable anti-bite device is equipped with a 30-degree optical glass lens, which can increase the irradiance of 120mW/cm within a distance of 1 inch, thereby improving the efficacy of infrared light therapy. Wide application range: Portable anti-bite device is very helpful for leg joint pain, back pain, shoulder pain, finger pain, knee pain, foot and neck pain.