Never used even for a single day after purchase.
Its functions:
Direct Airflow Blocking: It is hung below the AC so that cold air does not hit your body or head directly but spreads evenly throughout the room.
Physical Protection: It helps prevent colds, coughs, sore throats, or headaches caused by direct exposure to intense cold air while sleeping.
Easy Installation: No drilling or screws are required on the wall; it can be easily hung on the AC using plastic hooks or hangers.
Adjustable Size: These can usually be extended or retracted, and the wind angle can be changed.