Security: PTC products with constant fever, no open , heat conversion rate,subject to the supply voltage with impact and other heating elements can not match advantage,used in electric appliances in more and more popular in the R & D engineers. Energy saving: PTC product has an automatic energy-saving features,the heater when the ambient temperature is raised, the will be gradually reduced,only 90% of rated , 80%, or less. Long life: When PTC product under normal will not damage their own reasons,or even thousands of repeatedly switch has no effect on performance,a measure of life is degree of aging. General standards for decay after 2000 hours is less than 10%. Rated :100W Rated Voltage:220V AC/DC consistance temperature: 200 +/- 10 Celsius Size:113 x 35 x 26mm heat material: PTC Thermistor heat methods:heat radiation by lead wire: silicone high temperature line Suitable For:small instrument, small box body temperature heating space environment Package Contents: 1 x Insulated PTC Ceramic Heater Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.