... temperature of PTC. But the PTC temperature increase is limited, because the temperature is too high result in PTC ... (12V ~ 24V) of the. The same PTC Straight hair can be used in the voltage between 100V ~ 230V, ... 20 ~ 40W, according to the size of straight hair varies; Rafah when the power is much greater than the ... the battery can not maintain the heat straight hair. ptc hair straightener, wave board