External sound headphones

An acoustic system comprising:

• a headband, a plurality of sliders, a plurality of earphones, and a cable;
• wherein the acoustic system is adapted for use in listening to audio sources;
• wherein each of the earphones is formed with a port;
• wherein each port is opened and closed with a hinged cover;
• wherein when the hinged cover is opened, the port allows external sounds to pass freely through the earphone while the acoustic system is in use;
• wherein the port allows the wearer to monitor the environment while listening to the external sound headphones;
• wherein the headband is a hollow structure;
• wherein each of the plurality of sliders is a flat spring;
• wherein each of the plurality of sliders further comprises a first end and a second end;
• wherein the first end of each of the plurality of sliders is inserted into the hollow portion of the headband;
• wherein the second end of the each of the plurality of sliders is attached to the earphone selected from the plurality of earphones that is associated with the selected slider;
• wherein each of the plurality of earphones further comprises a frame, a speaker, a seal, a port, a mesh, and a hinged cover;
• wherein the frame is a rigid structure;
• wherein the frame is further defined with a first surface and a second surface;
• wherein the speaker converts electrical signals received from the audio source into audible sound;
• wherein the speaker is mounted to the first surface of the frame;
• wherein the seal is a pad that is attached to the perimeter of the first surface of the frame;
• wherein the seal is pressed against the head of the wearer by the tension supplied by each of the plurality of sliders;
• wherein the port is an aperture formed through the frame that forms a channel from the first surface to the second surface.