STETO ELECTRONIC RI-SONIC PCP-1 TRRS - stereo plug 4313 Ri-sonic Riester electronic stethoscopes are designed to enable real-time and remote auscultation. The PCP-1 stethoscope plugs directly into the microphone port of any smartphone, PC or tablet and can only be used with the eMurmur App. - Patented piezo technology detects body sounds while minimizing artifacts due to background noise - Patients can easily use the stethoscope on themselves, with the guidance of a doctor Ri-sonic electronic stethoscopes allow you to hear the internal sounds of a patient's body, such as heart, lung or bowel sounds.