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. saving: PTC product has an automatic -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%., Weight: 0.3086471668 pounds, Manufacturer: Yoeruers