The Serene House Shell Grey 90 Metal Ultrasonic Aroma Diffuser is a compact ultrasonic diffuser for professional spa, med spa, salon, or clinic use. Metal housing supports daily operation, with a cool mist output activated by adding water and essential oil. The unit offers continuous run up to 4 hours or intermittent run up to 8 hours to align with treatment lengths and client flow. A 60, 90, and 120 minute timer helps standardize room preparation, while 7 LED light colors can rotate or be fixed to a single color to match brand or room protocols. Approximate dimensions: 3.54 in width, 3.54 in height, 5.87 in depth. Read more