Welcome to Litzee! The LED therapy Hat is a hair loss treatment and hair growth equipment, which mainly stimulates weakened hair follicles in a painless way, strengthens the growth of hair follicles, and then promotes hair growth. The device includes infrared 850nm and red 660nm The LED Therapy Hat is specially designed to treat thinning hair and balding, help reverse and prevent hair loss and stimulate hair regeneration. Features: 3-gears adjustment, can operate under 10HZ and 40HZ pulses separately.Convenient for individual control. Package incldued: 1x LED Therapy Hat 1x USB Power Cord (2 meters) 1x User Manual Instructions for Use: 1.Put on the LED light therapy Hat 2.Plug power supply into electrical . 3.Press and hold on / off switch to start device. 4.You can only see the Red LEDs: the others are in the Infrared light spectrum and can"t be seen with the human eye. 5.Treatment time is 20 minutes, it will automatically shut off after 20 minutes. The device may be used multiple times pern day. 6.Press and hold on/off switch at any time to stop the device. In the title and description we have provided details of the product including its features and specifications, please note the size and dimensions of the product to ensure it meets your needs. Warm reminder: Due to lighting effects, monitor brightness, manual measurement, etc., there may be some slight differences in color and size between photos and actual items. Sincerely hope you can understand. I wish you a happy shopping!