Our ashtray needs 2 AA batteries, which can work about 40 times without charging. Suitable for anywhere including bedroom, office (batteries not included). The indoor ashtray is made of high temperature flame retardant material, which eliminates potential hazards, prolongs product life and is more . As a household ashtray, it has 4 small grooves for placing cigarettes. There is a filter sponge at the bottom, which can filter most of the gas. As long as you put a piece of fragrance inside, it can be used as a fragrance machine. Split design, more convenient to clean. If the insert becomes covered in , simply remove the liner and clean it with water. The built-in filter sponge is also washable and replaceable (must be dried). Each running time is 5 minutes and 20 seconds. This time can meet the habits of most people. Don't worry about forgetting to turn off the power to waste electricity.