The material of USB ashtray with negative ions is flame retardant high temperature nylon and fiberglass. With negative ions, 360-degree surround suction and silent operation. Built-in replaceable filters and aromatherapy tablets. Built-in negative ion filter cotton which can absorb tar and release negative ions. Bottom with side exhaust, circular exhaust. With double-layer separation design. Need two AA batteries, available 40 times. Does not included batteries.
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