The Classic is an ultrasonic diffuser that spreads therapeutic essential oil micro-particles into the air, delivering the restorative, uplifting boost you need in your environment. This diffuser can produce up to 1.2 million single cc negative ions. Negative ions help clear the air of mould spores, pollens, odours, bacteria, viruses, dust and other hazardous airborne particles by attaching to these positively charged particles in large numbers. So you get the lift of therapeutic oils plus healthy ion action. It's quiet as a whisper, simple to use and allows you to explore Absolute Essential's beautiful range of organic, medicinal quality plant oils. As a big added bonus it says "absolutely no" to plastics or fake wood.