Evironmental friendly: Only used with tap water and essential oil. Safe and energy-saving, environmentally friendly. Cute design: Duckling-shaped, full of naivety. Easy to cooperate, mini size, convenient to carry. Air Purifier, Humidifier, Aroma Diffuser, Air Fresher & Aroma Therapy - Five in one . Coverage area: 200 sq. ft., suitable for bedroom / living room (medium) / office conference room. USB Connects Directly to Computer also USB Adaptor can be used to connect directly to electrical socket Application area: Suitable for usage in indoor surroundings including baby room, bedroom, sitting room, toilet, KTV room, office, hospitable, etc. Area Covered Approx. : 15M3 Model Name/Number : MI-518-USB Material : Poly Propylene Power DC : 5V : 3W Water Capacity : 360 Ml Shape : Round Power Source AC Source Operating Principle Passive Purifying Technology Water Based Anion Density : 1000000pcs/m³ Frequency : 50-60Hz Certification Ce,Gs,Rohs,Ul Approved,Patented