New Flat Iron Mini 2 IN 1 Wireless Hair Straightener with USB Charging Roller 4800mah Portable Cordless Curler Dry and Wet Uses Feature Step A: Open the sleeve. Step 2 B: Turn on the security switch; The 0.33 step C: prolonged press the replace key for three seconds; Step four E: Click on/off to alter the temperature gear; Step 5F: Insufficient power, use USB to commission (5V/2A); Reminder: When combing hair, it's endorsed to take a small number of hair each time (about 2 small palms width hair) for operation, the impression is better.