High Quality. Full Function. Economic Model. 5 Working Modes. 3 Fan Speeds. Accurate & Stable Temperature Control. Accurate & Stable Auto Fan. Timer Inline/Offline. Sleep Mode. Auto Defrost. Double Sensor. Prevents cold wind in heating mode. Auto restart function. Outdoor fan is controlled independently. Deluxe receiver, nice appearance, visual work status display. Transformer connection upgrade with fast plug socket for easier installation.