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Many new computers and laptops have a single audio jack that accommodates either headphones or microphones. If you are using a PCP-1 Mic Port Stethoscope and a headset with a 3.5 mm stereo connector, you will need separate ports into which the stethoscope (microphone) and the headset can be plugged.
This specialized cable separates incoming and outgoing audio so that the headset and stethoscope can be used at the same time and allow for local listening by the physician, nurse or tech. Even if not using a headset, the stethoscope will still need to be plugged into the microphone port on the splitter when using a laptop or PC with the single universal audio port.