ESAY TO USE: Stylish and compact design, portable size for easy carrying when travel. Easy to operate with user-friendly guide included. Lighter or deeper penetration suitable for both professional and personal use. Note: The 808nm light is invisible to the human eye（But it can be seen through the phone's camera.） For different body parts, there are different recommended methods of use. Use know that the instructions are included in the package. This device has a perfect combination of 12x 650nm diodes and 2x 808nm diodes.A rechargeable 2600mAh lithium battery inside, when fully charged for 2 hours, its duration time reach 4 days. INTEGRATIVE LASER/RED LIGHT : The apparatus adopts the principle of modern infrared light , combined with the theory of acupuncture and moxibustion of traditional Chinese medicine, the original light acupuncture and light circulation.