Features 1. More concentrated energy: Strong penetration ability, suitable for physical therapy in small and concentrated areas. 2. Lightweight and portable: With a small size, it is easy to store and carry, and can be easily placed in a backpack, making it suitable for travel. 3. Near infrared light: can deeply penetrate the skin: directly reach the pain point, thereby more effectively relieving pain. 4. Shorten treatment time: Equipped with a 30 degree optical glass lens, it can increase the irradiance by 120mW/cm at a distance of 1 inch, significantly enhancing the infrared efficacy. 5. Widely applicable: It has a significant relieving effect on leg joint pain, back, shoulder, finger, knee, foot, and neck pain. Specification parameters: Product type: Portable infrared therapy device Built in battery: Lithium battery 2000mAh Size: Approximately 11.8 x 2.5cm/4.6 x 0.98 inches Note: The 850 nanometer wavelength band is invisible to the naked eye Application Description: 1-1: Achieve mild physical therapeutic effect through physics principles, emitting spectral bands of 630nm, 660nm, and 850nm (in the same frequency band as helium neon laser, with deep penetration). After red light penetrates the human body, its spectral effect (converted by red light) can enhance the effect of light on mitochondrial catalase activity, promote cellular metabolism and protein synthesis, improve local blood circulation, and inhibit the spread of infection. Package Include: 1 x Red Light Physical Therapy Device