1. The inner parts are made of stainless steel, corrosion resistance, product lifetime is ten years. 2. Adopt japanese hitachi compressor, hydrophilic aluminum fin, internal thread tube. 3. The functions include cooling, heating, ventilation, dehumidification, timing on/off, auto-restart. 4. Adopt spraying & evaporation technology, the condensed water can evaporate automatically. 5. Use wireless remote control, lcd display, and automatic fault diagnosis. 6. Current overload protector for compressor, motor and other electrical parts. 7. Ceramic ptc heater with overheat protection device (optional). 8. Installation and maintenance are simple.