describe: Convex optical design: Convex lamp beads can make the light more concentrated and spread the light in a straight line. It can reach 1-3mm hair follicles, activate the hair follicles, and allow them to re-enter the healthy growth period. Different lighting effects: Various data show that light of different wavelengths can meet different light transmission requirements. This product has two wavelengths, 670nm and 830nm, which can meet the needs of different parts. Two pulse modes: 10Hz pulse mode is the best solution for relieving headaches and insomnia, while 40Hz pulse mode is good for photobiomodulation, providing comprehensive care for your head. High quality, lightweight: low light attenuation, long service life. Foldable and portable, it weighs only 133 grams (4.7 ounces). No burden to use. Automatic timer function: Automatically shuts down after 20 minutes of power-on, so you dont have to worry about over-treatment. If you need to pause during use, you can long press the switch to turn it off. It is recommended to use it for 20 minutes each time, 3-4 times a week. Package contents: 1 piece of hair growth cap