Volumize, curl, smooth, and straighten your hair with the Calista Perfecter Pro Swap Top. Easily customize your style with three round brush heads featuring top-quality nylon bristles that are perfectly aligned to gently hold hair to the barrel while gliding through each strand. How do I use it: Use on dry hair only. Select brush head needed for desired results. Twist handle to the unlock position, slide on brush head, and turn handle to lock. Hold power button for five seconds to turn on. Use the lowest heat setting for fine or color-treated hair; use the highest heat setting for coarse or resistant hair. Desired temperature will be reached in three minutes. Hold power button to turn off. Unplug and let cool before changing brush head. From Calista.