A device for double fragrance diffusion of scents is provided with an internal mechanism 18 comprising gear means 18.1, 18.2, 18.5 and a cam 18.4, featuring a flat surface positioned in such a way as to adhere to the lower flat surface 6.1 of at least one of two pressurized containers 6 and a toothed surface engaging said gear means operationally connected to a direct current electric motor 19 which, upon starting, operates said cam and triggers a lower thrust on a container 6, or alternately in the other, as a function of the sense of rotation of the cam, and makes a pressurized scented liquid go out from the valve 6.2 provided with a conveyer 6.3 conjugated with either hole 7 of an outer case 2, in the form of an aerosol. The device is provided with a control unit for controlling said release mechanism 18 and for selecting the fragrance that is appropriate for the assessed environmental conditions; for this purpose, the device is provided with sensors internal with respect to the device which allow to monitor the thermo-hygrometric and acoustical conditions of a reference environment and of actuators for interacting with users by way of sensorial alerts. The device can be a component part of a kit also comprising two pressurized containers, each containing a scented liquid, and a support, positionable inside a compartment of the intelligent device, for a removable insertion of the two containers.