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, instrum Voltage: 220V Power: 750W Hole pitch: 120 x 68 mm Installation hole: 8x4 mm Size: 140x76x26mm (with ripple length of 96mm) Note: No need to distinguish "Positive pole"and "negative pole. Material:Aluminum+Plastic+Ceramic PTC colour:Black + Silver Package Contents: 1 x PTC Air Heater 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.