Automatic timing: Electronic ashtray does not need to be charged, but also automatic timing control 5 minutes and 20 seconds to turn off and waste electricity. High quality flame retardant material: Ashtray smoke exhaust liner is made of super hard flame retardant material , eliminates safety risks, providing good protection for ashtrays. Multifunction Ashtray: After our ashtray air purifier is opened with a key, the ashtray uses a natural air suction structure that relies on the suction force formed by aerodynamics . Ashtray Air Purifier: Features 360-degree three-dimensional surround smoke, a variety of purification filters and quiet operation.Helps absorb smoke, eliminate the smell of cigarettes or cigars and filter pollutants. Negative ion purification: The ashtray cleaner uses a filter screen and negative ion purification, and the air purification is more thorough.Built-in negative ion filter cotton, adsorbs tar.