Features Using PTC ceramic heating element and aluminum tube, the thermal resistance is low and the heat transfer efficiency is high. This PTC ceramic air heater features surface insulation and high safety. This product is an automatic constant temperature and energy saving electric heater. It is mainly used for heating the ambient temperature of small instruments and small boxes. Applications: air conditioners, electric heaters, instrumentation, general electrical appliances, air curtains, humidifiers, etc. Features: -Using PTC ceramic heating element and aluminum tube, the thermal resistance is low and the heat transfer efficiency is high. -This PTC ceramic air heater features surface insulation and high safety. -This product is an automatic constant temperature and energy saving electric heater. -It is mainly used for heating the ambient temperature of small instruments and small boxes. -Applications: air conditioners, electric heaters, instrumentation, general electrical appliances, air curtains, humidifiers, etc. Specification: Material: Aluminum & Plastic Weight: 128g/4.5oz Heating material: PTC thermistor  Heating mode: heat through the flow of air Power: 200W  Voltage (Optional) : 110V / 48V (the bare line is connected, regardless of the positive and negative pole, the rated voltage can be)  Mounting distance dimensions: 56*68 mm (8*4 mm waist type hole)  Corrugation Length: 30mm Size: 76*76*26mm/3*3*1inch Note: 1.With 70 degrees normally closed temperature control protector. 2. Lead color is random. Package List