----improved circuitry maintains a more constant styling temperature. The iron heats up to its maximum temperature every millisecond ensuring optimum heat on the hair from root to tip. ---- sleep mode function automatically switches iron off if it is not used for 30 minutes. ----universal voltage feature operates from 110v to 230v by sensing the incoming voltage, making it great for travelers. ----includes an instructional dvd. High performance properties: - designed to create curls, twists, flicks, and waves, as well as straighten the hair. 12pcs/ctn