A wearable device for transdermal product supply, comprising: - a head, which includes: - a proximal area intended to be, when in use, closer to the skin of a user, - a distal area, intended to be, when in use, farther away from the skin of the user, and - an outer cavity, defined in the proximal area, and intended to be oriented, when used, towards the skin of the user; - a first resonator, housed in the distal area of the head, for working in resonance at a first frequency, emitting ultrasound towards the skin of the user at the first frequency; and - a second resonator, housed in the proximal area of the head, for working in resonance at a second frequency, emitting ultrasound in a direction parallel to the skin at the second frequency; wherein one of the first and second frequencies is a high-frequency sonophoresis frequency and the other frequency is a low-frequency sonophoresis frequency, wherein the head is configured such that it enables the waves emitted by the resonators (1, 2) to circulate through the head without encountering gaseous material before leaving the head; characterized in that the second resonator comprises an inner through hole in order to enable the waves from the first resonator to pass through without hitting the second resonator, as well as a portion of the cavity of the head, corresponding to the height of the second resonator, is surrounded by said second resonator, and wherein the waves from the second resonator are directed through the head, the hole and the cavity, in order to bounce off the head in an opposite position and interfere with the waves from the first resonator. - a head, which includes: - a proximal area intended to be, when in use, closer to the skin of a user, - a distal area, intended to be, when in use, farther away from the skin of the user, and - an outer cavity, defined in the proximal area, and intended to be oriented, when used, towards the skin of the user; - a proximal area intended to be, when in use, closer to the skin of a user, - a distal area, intended to be, when in use, farther away from the skin of the user, and - an outer cavity, defined in the proximal area, and intended to be oriented, when used, towards the skin of the user; - a first resonator, housed in the distal area of the head, for working in resonance at a first frequency, emitting ultrasound towards the skin of the user at the first frequency; and - a second resonator, housed in the proximal area of the head, for working in resonance at a second frequency, emitting ultrasound in a direction parallel to the skin at the second frequency; wherein one of the first and second frequencies is a high-frequency sonophoresis frequency and the other frequency is a low-frequency sonophoresis frequency, wherein the head is configured such that it enables the waves emitted by the resonators (1, 2) to circulate through the head without encountering gaseous material before leaving the head; characterized in that the second resonator comprises an inner through hole in order to enable the waves from the first resonator to pass through without hitting the second resonator, as well as a portion of the cavity of the head, corresponding to the height of the second resonator, is surrounded by said second resonator, and wherein the waves from the second resonator are directed through the head, the hole and the cavity, in order to bounce off the head in an opposite position and interfere with the waves from the first resonator. wherein one of the first and second frequencies is a high-frequency sonophoresis frequency and the other frequency is a low-frequency sonophoresis frequency, wherein the head is configured such that it enables the waves emitted by the resonators (1, 2) to circulate through the head without encountering gaseous material before leaving the head; characterized in that the second resonator comprises an inner through hole in order to enable the waves from the first resonator to pass through without hitting the second resonator, as well as a portion of the cavity of the head, corresponding to the height of the second resonator, is surrounded by said second resonator, and wherein the waves from the second resonator are directed through the head, the hole and the cavity, in order to bounce off the head in an opposite position and interfere with the waves from the first resonator.