Abstract: Comprises a vessel (1) containing scented liquid, a wick (2) partially submerged in the liquid, a stopper (3) coupled on the mouth (7) of the vessel (1) and a cap (5) that covers the stopper (3) and has a lower tubular portion (11) provided with two windows (15) and an inner threaded segment that unscrews from a central threaded tubular portion (13) of the stopper (3) as the cap (5) is turned, raising it and gradually revealing the windows (15) so that the wick (2) is exposed to the exterior, facilitating the adjustable evaporation of the scented liquid, the cap (5) being provided with flexible stops (16) that are prolonged externally from the base of its lower tubular portion (11) and as they rise meet a trapezoidal inner peripheral flange (17) defined in a cylindrical body (14) of the stopper (3) to prevent the exit of the cap (5).