Introduction: CH118 could use plugin or 3 pieces D size batteries for power supply. It is perfectly for the washroom, toilet, KTV, hotels and more small areas which is up to 200 cubic meter. With automatic lock function for the system setting ,well protection in the public places. Features: 3 pieces D size battery for the power supply. Wall mounted installation, tabletop installation optional. Easy installation. Perfectly for 50-200m3 areas. With anticorrosion plastic material. Adjustable working time 24 hours and 7 days and intensity. Automatic control program. Saving international transportation fee due to its light weight. Technical Data: Model No.: CH118 Shell Material: Plastic Color: White and Black Dimension: 152*73*212mm Net Weight: 0.7 kg Power Supply:3 pieces D battery 5W Coverage:50 to 200 m3 Installation Way:Tabletop Wall Mounted Essential Oil Bottle Capacity: 120ml Noise Level : 38 dba Please contact us ,Ask the price list and catalog today!