A source of gaseous substance contained in a gas or drops for mounting in a dispenser in use, said source: a pressurized inner container (1) for the substance, a valve device for substance release (2) seal through an end (3) of the pressurized inner container (1) and having a spring, a mouthpiece (4) in a nozzle end (15) of pressurized inner container (1) which can move within the container (1 ) against the spring of the valve device to release substance, also including source: an outer casing (11) surrounding the inner container pressurized along its length (12) at least partially through its end (14) away from the nozzle (4) and partly at its nozzle end (15), the outer casing (11) and the pressurized inner container (1) arranged to be able to react to cause displacement of the nozzle (4) to being inside of the inner container pressurized (1) to release substance； a counter (20) accommodated within the outer casing (11) for counting substance release displacements of the nozzle (4)； and a window (22) in the outer casing (11) for the count of the counter (20).Una fuente de sustancia gaseosa, contenida en un gas o en gotas para su montaje en un dispensador en uso, teniendo dicha fuente: un recipiente interior presurizado (1) para la sustancia, un dispositivo de válvula de liberación de sustancia (2) sellado a través de un extremo (3) del recipiente interior presurizado (1) y que tiene un resorte, una boquilla (4) en un extremo de boquilla (15) del recipiente interior presurizado (1), que puede desplazarse hacia dentro del recipiente (1) contra el resorte del dispositivo de válvula para liberar sustancia, incluyendo también la fuente: una carcasa externa (11) que envuelve el recipiente interior presurizado a lo largo de su longitud (12), al menos parcialmente a través de su extremo (14) alejado de la boquilla (4) y parcialmente en su extremo de boquilla (15), estando la carcasa externa (11) y el recipiente interior presurizado (1) dispuestos para ser capaces de reacci
