Product feature and description for best professional ceramic PTC heater 9-25mm tong black curling iron: 1.Working voltage: 110V-230V;50-60HZ 2.PTC heating element fever, three minutes to achieve the highest temperature of 210 degrees , this style have no temperature control function. 3.Direct electricity heating, use PTC heating element itself to control temperature range, have no indicator light . 4.Colour:Hot Pink,Deep Purple,Black 5.3 optional sizes of tong:9-18mm,18-25mm,25mm. 6.power:25-65W