Thank you for viewing. This slim, temperature-adjustable straight heat brush is easy to use. Simply brushing your hair will straighten out bedhead, frizz, and waves, making your hair manageable even on busy mornings. The temperature can be adjusted from 100°C to 210°C in 5°C increments. It has an auto power-off function that automatically turns off the power after about 30 minutes. Press the power switch twice in a row to lock the button operation, and press it twice again to unlock. I have only used it a few times, but please refrain from purchasing if you have any reservations. There is no box or instruction manual. It has been disinfected.