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 is insulated. safe and . EASY TO USE: With mounting hole, it is easy and convenient to install. WIDE APPLICATIONS: Fit for air conditioner, electric heater, instrument, general appliance, machine, humidifier , widely used. Voltage: 220V Power: 600W Hole pitch: 104 x 68 mm Installation hole: 8x4 mm Size: 124 x 76 x 26mm (with ripple length of 80mm) Colour:Black+silver Material:Aluminum+Plastic+Ceramic PTC Package Contents: 1 * PTC Air Heater Note: No need to distinguish "Positive pole"and "negative pole. Only 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.