The Sauna Aromatherapy Kit comes complete with an easy to attach diffuser holder glass diffuser and 1/2-oz bottle of pure Eucalyptus oil. At the end of a busy stressful day simply add a few drops of the Eucalyptus oil to the glass diffuser. Then sit back and relax in your sauna while the aroma of the Eucalyptus oil stimulates your nervous system creating a cool refreshing effect that eliminates exhaustion and mental sluggishness.