This is the normal fan motor sound inside the machine for spraying OH radical. If you switch to NIGHT MODE, the speed of the motor decreases and the noise of the device decreases. If you hear other noise, please check with service center.
If the pinwheel indicator light is on, it means that the device is well operating. When changing the night mode, only night mode LED on. If you want to switch to NORMAL MODEJust press NIGHT MODE once more.
Cartridges should be kept away from direct sunlight and cool or temperature (18~25 degree C) or refrigerated storage is recommended. Due to the liquid(orange extracted oil) contained in the cartridge, the boiling point is low, so it should be stored with more care in summer, and if stored for a long time after parking, cartridge liquid may deteriorate.