Smart Scent Machine 200ml Wall Mounted Essential Oil Diffuser Aromatic Machine with Fan for Home Hotel Office Item Type: Smart Scent Machine Material: PP plastic Weight: Approx. 941g/33.2oz Battery: Model CR2032, lithium manganese buckle batteryx1, 220mAh (shipped with built in battery) Function: Aromatherapy Noise: < 38dba Application Range: 100 to 200m³ Maximum Range: 300m³ Fogging Amount: essential oil concentration is adjusted to 95, 0.7 to 1ml/h Installation Mode: Flat place, wall hanging Essential Oil Capacity: 200ml (shipped without liquid) Operation Mode: Intelligent PCB Product size: Approx. 21.5x15.5x7.5cm/8.5x6.1x3.0in Mounting Hole Distance: 7.5cm/3.0in Occasions: Hotel, family, physiotherapy, hot spring resort, sauna, SPA, KTV, leisure club