The wood Essential Oil Diffuser absorb and keep essential oils longer without water and electricity, eco-friendly and safeNatural tool for relieve tension and stress in daily busy work, driving, sleeping, long-distance travel, business tripsMaterial: wood, volcanic Lava stone, premium stainless steel clip with rubber tubeColor: wood colorConvenient to use: Just drip 2-5 drops essential oil on the natural wood locket, then clip on car air-conditioning vent or home air condition ventperfect gift for family and friends. A perfect gift for birthday/Christmas/Anniversary/Father's Day/Mother's Day/Valentine's DayPack content:4 * Air FreshenersOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.