Safety protection- fireproof E box (indoor) and refrigerant leakage detection. Dual Filter- eliminates harmful substances, providing clean air. Golden Fin- The unique anti-corrosive golden coating on the heat exchangers can withstand salty air, rain and other corrosive elements. It also effectively prevents bacteria from breeding and improves heat efficiency. 3D Airflow- controls the flow and direction of the air to cool every corner of the room, giving constant comfortable temperature. Smart - WiFi control ready (dongle purchased separately). Highly efficient compressor- operates under extreme hot temperatures (up to 68°C) and extreme cold temperatures (as low as -32°C) while saving energy costs. Stability protection- can withstand voltage fluctuations (overloads) without a separate voltage stabilizer.