ELECTRIC DIFFUSER retails for $135 + tax so around 150$. Used once For the wall Simply press to release the perfume. This electric diffuser uses the air itself to deliver the notes of nine iconic Diptyque scents. A durable, esthetically pleasing object that can be carried from room to room or slipped into your suitcase to perfume any transient location. Designed to scent spaces averaging +/- 25 m' in size The cartridges can be kept for up to 3 months after opening, provided the bag is properly sealed after use. Product keeps for 18 months in the airtight bag after opening. 40 hours of continuous life for the cartridge, i.e. up to 13 diffusion cycles (1 cycle lasts 3 hours). Size: height 3,1"; width 2,6" 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. 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).