How to Use: The machine is simple to operate with one key, use for 20 minutes each time, and it will automatically turn off after 20 minutes.It is recommended to use in indoor environment at 25℃ for good effect. It is used 3‑4 times a week on average, and can be used once a day in severe cases. Use time and effect: Use 4 to 18 weeks to improve scalp oil secretion, hair loss will return to normal levels. Use for 18‑26 weeks to improve the hair growth environment, resulting in thicker, fuller, and healthier hair. After 26‑52 weeks of use, hair growth enters a full growth cycle, the number of hairs increases significantly, and the hair follicle germinal system returns to its original normal function. Specification: Item Type: Hair Growth Helmet Material: ABS Product Voltage: 100-240V Laser Chips: 160pcs Single Light Chip Diameter: <1cm / 0.39in Use Time: 20min Size: Approx. 25.8 x 20.2 x 12.8cm / 10.16 x 7.95 x 5.04in Laser Wavelength: 650nm Light Emission: 15° Single Laser Power: < 1MW Package List: 1 x Hair Growth Helmet 1 x Instruction 1 x Adapter Note: 1. The machine is simple to operate with one key, use for 20 minutes each time, and it will automatically turn off after 20 minutes.2. It is recommended to use in indoor environment at 25℃ for good effect. It is used 3‑4 times a week on average, and can be used once a day in severe cases. Special Note: Do not use this product directly irradiate to the eyes! Especially children!