... seconds after hair is straightened. But the PTC heater needs 2-3minutes to renew temperature.3.Because the ... but PTC can't do it; the ceramic heater is safe and ideal for applying to top-gradehair ... , 220V it can bear high voltage of 5000V7.Ceramic heater pass 30 minutes 'On', 30 minutes 'off' for ... 1000 cycles life test.8.Specification of Ceramic Heater:Length x Width, Resistance, Voltagea.70±3% mm ...