3.The ashtray tray is specially designed with four small grooves for fixing butts. It is easy to carry and can be used for family, business and business travel. 1.The intelligent ashtray is not just an ashtray: it can absorb smoke and odor. It helps to remove second-hand smoke and pollution particles from the air, creating clean and pure air for your home. 2.The ashtray of the air purifier is equipped with a negative ion purification filter to absorb smoke and odor, filter dust in the air, and then release negative ions and air. 4. supply and easy to use: our ashtray requires 2 AA batteries, which can work about 40 times, no need to charge. Suitable for use anywhere including bedroom, (batteries not included).