CERAMIC AND ALUMINUM:PTC Ceramic Air Heater adopts PTC ceramic heating elements and aluminum tube, low thermal resistance, high heat transfer efficiency.CONSTANT TEMPERATURE FUNCTION: PTC Ceramic Air Heater is a electric heater with automatic constant temperature and energy saving.SAFE: The lead material adopts high temperature resistance wire and and the surface is insulated. safe and durable.EASY TO USE: With mounting hole, it is easy and convenient to install.WIDE APPLICATIONS: Fit for air conditioner, electric heater, instrument, general appliance, air curtain machine, humidifier , widely used.Voltage: 220VPower: 300WHole pitch: 100 x 42.5 mmInstallation hole: 8x4 mmNote: No need to distinguish "Positive pole"and "negative pole.color:Black+silverMaterial:Aluminum+Plastic+Ceramic PTCsize:120 x 50.5 x 26mmPackage Contents:1 x PTC Air HeaterOnly the above package content, other products are not included.Note: Light 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.