Activate with a simple touch anywhere on the vent to switch the device on and off. A light puff of air indicates that the ventilation system is on. - After powering on, wait 15 to 30 seconds before handling the device to allow the sensor to calibrate. - The diffusion stops just as instantly as it started (manually or automatically after a pre-programmed cycle of about 3 hours), leaving no trail, allowing you to choose and change the fragrance as you wish. - The refill is interchangeable at any time, as the diffuser does not retain any traces of the previously used fragranced refill. - The cartridges can be kept for up to 3 months after opening, provided the container is properly closed after use. - Lifespan of 40 hours continuously, ie up to 80 diffusion cycles (1 cycle corresponding to 1 hour).