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This small ingestible PSM device enters the digestive tract as a pill and contains a thermistor to measure temperature and an electret hydrophone and processing circuitry to collect, amplify, and filter audio signals to derive heart and breathing rates from noisy data. The data is wirelessly transmitted to a receiver outside the patient. This device can collect data anywhere along the digestive tract regardless of contact with tissue. The PSM device can be either transient and excreted normally, or persistent and affixed in the digestive tract. The PSM device has a relatively long battery life of at least 4 days, but persistent devices may be powered through inductively coupled or wireless resonant recharging.