A full face diving mask having a transparent visor (2), a frame or strapping (3), a sealing skirt (4) to ensure the water-tight seal, and suitable straps (5) for fitting the mask on the user's face. The mask has a breathing tube (6) which engages on the tipper part of the mask and which allows the flow of air to enter into the compartment made between the frame and the visor. The breathing tube is made with separate ducts for the air inhaled and exhaled and the inside of the mask is made with two compartments, an upper main compartment (26) and a lower oronasal compartment (7) separated by a separating wall.

A full face diving mask having a transparent visor (2), a frame or strapping (3), a sealing skirt (4) to ensure the water-tight seal, and suitable straps (5) for fitting the mask on the user's face. The mask has a breathing tube (6) which engages on the tipper part of the mask and which allows the flow of air to enter into the compartment made between the frame and the visor. The breathing tube is made with separate ducts for the air inhaled and exhaled and the inside of the mask is made with two compartments, an upper main compartment (26) and a lower oronasal compartment (7) separated by a separating wall.

A diving mask includes a facial body and at least one transparent element which enables viewing and is adapted to overlap the eye area, made by co-molding at least two different thermoplastic elastomers, the transparent element being made from a thermoplastic elastomer provided with a relatively greater degree of hardness, the facial body being made from a thermoplastic elastomer provided with a relatively lower degree of hardness.

A diving mask includes a facial body and at least one transparent element which enables viewing and is adapted to overlap the eye area, made by co-molding at least two different thermoplastic elastomers, the transparent element being made from a thermoplastic elastomer provided with a relatively greater degree of hardness, the facial body being made from a thermoplastic elastomer provided with a relatively lower degree of hardness.

The invention relates to a sound reproduction device which comprises a signal source, a power source, an amplifier, and a loudspeaker. The sound reproduction device further comprises an impedance measuring device and an analysis device. The impedance measuring device is connected to loudspeaker leads of the loudspeaker in order to measure impedance values, and the impedance measuring device is connected to the analysis device in order to forward the measurement results. The analysis device is also connected to the signal source and/or to the amplifier in order to adapt a signal fed to the loudspeaker.

The invention relates to a sound reproduction device which comprises a signal source, a power source, an amplifier, and a loudspeaker. The sound reproduction device further comprises an impedance measuring device and an analysis device. The impedance measuring device is connected to loudspeaker leads of the loudspeaker in order to measure impedance values, and the impedance measuring device is connected to the analysis device in order to forward the measurement results. The analysis device is also connected to the signal source and/or to the amplifier in order to adapt a signal fed to the loudspeaker.

A diving mask includes: a facial body made of an elastomeric material and having at least one opening adapted for positioning at least one transparent element, the outlet edge of the opening being shaped to provide a sealing gasket for the peripheral edge of the transparent element; a back mount made of a material of reduced flexibility, having a shaped that is substantially complementary to the opening and adapted to cooperate with the sealing gasket; and a front frame made of a relatively stiffer material, adapted to tighten the sealing gasket against the back mount, the front frame and the back mount being provided with releasable mutually-engaging members, the back mount being further provided with at least one fin protruding outwards radially.

A diving mask includes: a facial body made of an elastomeric material and having at least one opening adapted for positioning at least one transparent element, the outlet edge of the opening being shaped to provide a sealing gasket for the peripheral edge of the transparent element; a back mount made of a material of reduced flexibility, having a shaped that is substantially complementary to the opening and adapted to cooperate with the sealing gasket; and a front frame made of a relatively stiffer material, adapted to tighten the sealing gasket against the back mount, the front frame and the back mount being provided with releasable mutually-engaging members, the back mount being further provided with at least one fin protruding outwards radially.

A highly automated, fully-closed circuit rebreather and methods for operating the device by users with limited training and limited skill development are disclosed. Advanced sensors, electronics, software, assembly methods, and disposable cartridges dramatically reduce the skills required for assembly, operation, and maintenance of the unit. The use of the rebreather apparatus is primarily for recreational diving applications, but may be used for additional applications where the presence of breathable air may be absent or limited, such as hazardous duty applications, high altitude applications, no-atmosphere or low-atmosphere applications, and the like.

A nose equalizing device of an underwater mask is provided. The nose equalizing device includes two pouches, each having an opening and a bottom portion corresponding to the opening. Each of the bottom portions is preformed into a first shape having a plurality of continuous folding portions and is in a first position distal from a nose wing of a user. When two fingers of the user exert forces inwardly toward the bottom portions from the openings of the two pouches, respectively, each of the bottom portions is capable of being stretched and deformed into a second shape and being in a second position proximal to the respective nose wing of the user. When the exerted forces are released, each of the bottom portions is capable of automatically or by a reverse force outwards, returning to the first position and restoring to the first shape.