Feature: This product is suitable for small space heating, dehumidification and warmth preservation within 0.5 cubic meters. Because of the temperature resistance limitation of the fan, the heater is suitable for the ambient temperature range of -5 - 65℃. Surface insulation, safe to use. This product is suitable for heaters, air conditioners, automobiles, etc. Specification: Voltage: 110V Rated power: 250W; 350W(Optional) Working voltage of fan: 12V; 24V (Optional) Product dimension: Approx. 90 x 61 x 42mm / 3.5 x 2.4 x 1.7in Distance of installation hole: Approx. 86mm / 3.4in Diameter of installation hole: Approx. 4mm / 0.16in Suitable room: <0.5m³ Package list: 1 x PTC Heater with Fan Note: Red is the positive pole and black is the negative pole. The outlet wires of heaters and fans can be separately connected to the power supply. Fans must be inputted by DC. PTC heaters are not divided into AC and DC. The power of all PTC products is not a fixed value, but a range. The power range of this fan heater is within the (+20%) range of the labeled power. The power of different ways of using the same product is different. Simply speaking, the better the heat dissipation, the greater the power. The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.