I only used it to try it out. I no longer need it because my perm came back. It was relatively easy to use and I found it very helpful. USB rechargeable heat curler, curls firmly in about 45 seconds. - Model Name: Heat Curler - Power Source: USB Rechargeable - Color: Pink - Usage Time: About 45 seconds - Features: Double effect for curls - Brand Name: SHOBIDO Thank you for looking.