1.5 Gallon tank capacity, operates up to 18 hours. Water empty automatic shut off switch and refill light. Adjustable mist volume control. Built-in Ionizer with indicator light. Easy to fill a transparent water tank. Whisper-quiet operation, won't disturb sleep. Removable tank with handle for easy filling. Build-in 2-8-12 hours timer. Moisture output: 300ml/h.