Attention: This link only sells Filter only. Ashtray not included. Only fit for the round smokeless ashtray. The multi-layer filter design uses filters with an efficiency of 99.7% for 0.1 and 0.3 , which can effectively filter smoke. The filter is a consumable and can be replaced according to the use time. The normal filter use time is about 800 hours. The use time will be shortened in a harsh environment. It has strong suction power and can purify the air by adding aromatherapy tablets and filter cotton, reducing the harm of second-hand smoke to the human body. Very suitable for families, offices, bars, cafes, hotels, restaurants, parties, buffets, etc.