This essential oils Pendant is the perfect solution for releasing a light aroma from essential oils and/or perfume. Works perfect to keep a few drops of your favorite essential oil with you at all times. Simply unscrew cap and pour out essential oils! How The Essential Oil Diffuser Necklaces Work :Simply unscrew the top cap from the stainless steel vial and gently add a few drops of essential oils in the bottle.If you are going to be laying down， it's recommended to use just 1 drop. The aroma from the essential oils or perfume will release through the holes in the cap. How To Clean Diffuser Necklaces :Get a Q-tip and remove some of the cotton on the end until it will fit inside stainless steel bottle and swab out. Note: 1. For best result Using only high quality， pure essential oils. 2.The necklace come with luminous material in it， it need to absorb light in the daytime， then it can give out the blue backlighting at night or in the darkness.