New Flat Iron Mini 2 IN 1 Wireless Hair Straightener with USB Charging Roller 4800mah Portable Cordless Curler Dry and Wet UsesFeatureStep A: Open the sleeve 2 B: Turn on the safety switch;The third step C: prolonged press the change key for three seconds;Step four E: Click on/off to modify the temperature gear;Step 5F: Insufficient power, use USB to payment (5V/2A);Reminder: When combing hair, it's endorsed to take a small quantity of hair at any time when (about 2 small fingers width hair) for operation, the impact is better.