Skull Crystal Cave LED Backflow Incense Burner. Backflow incense smoke flows down through a backflow burner and creates a mist in and around the product. This item must be placed on a heatproof surface. When backflow incense burns the mist it creates can leave a light residue on the burner and the surface the burner is placed on. This is from natural oils and resins within the incense and can be wiped clean with a damp cloth. For use with backflow incense cones only. 1x unfragranced cone included. Requires 2x AA batteries (not included). Made from resin. Measures approximately H17cm x W9.5cm x D11cm. Comes in a plain box.