Security: PTC products with constant fever, no open flame, heat conversion rate,subject to the supply voltage with minimal impact and other traditional 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 power be gradually reduced,only 90% of rated power, 80%, or less. : When PTC product under normal use not damage their own reasons,or even thousands of times repeatedly switch has no effect on its performance,a measure of its life is its degree of aging. General standards for power decay after 2000 hours is less than 10%. Rated Power:100W Rated Voltage:220V consistance temperature: 200 +/- 10 Celsius Size:113 x 35 x 26mm heat material: PTC Thermistor heat methods:heat radiation flow lead wire: silicone high temperature line Suitable For:small instrument, small box body temperature heating space environment Package Contents: 5 x Insulated PTC Ceramic Air Heater Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.