300ml Ultrasonic Oil Diffuser

Dry bedroom air has a way of announcing itself at three in the morning. A 300ml tank gives this ultrasonic diffuser 10 to 12 hours of steady cool mist, which is enough to hold gentle humidity in a bedroom or nursery straight through the night with no midnight refill. Fill it before bed, switch it on and it simply keeps going until morning, then shuts off safely when the water runs out.

An upgraded 2.4MHz ultrasonic transducer breaks water and oil into a finer mist than older units manage, so the vapour hangs in the air and spreads through the room instead of settling in a damp ring on the furniture around it. The whole thing runs between 25 and 35 decibels, quieter than a library reading room, which means it disappears into the background rather than adding a hum you end up listening to.

A 7-color LED glows softly through the housing and can be held on one shade or left to cycle, making a useful low night light for a hallway, a child's room or a bedside table. Refill with clean water and a few drops of pure essential oil, rinse the tank regularly to keep the mist clean, and set it on a stable surface out of reach of children and pets, with any oil bottles stored closed and safely away.

• 300ml tank running 10 to 12 hours on one fill
• 2.4MHz ultrasonic transducer for a finer, longer hanging mist
• Quiet 25 to 35dB operation for bedrooms and nurseries
• 7-color LED that holds on one shade or cycles softly
• Automatic shut off when the water tank runs empty
• Place out of reach of children and pets, store oils closed