Back-flow incense might take 30-40 seconds to start, After it creates an illusion of a smokey waterfall Simply place an incense cone at the top, the smoke starts to flow in reverse direction, that is from top to bottom, and in-turn creates a beautiful smokey waterfall. Can be used as a gift for your friends, business partner or family members. Gentle wash, use dry/wet cotton cloth to remove dirt. Net Content: 1 Smoke Fountain Idol and Incense Cones