Abstract: Various implementations include systems and approaches for determining user oxygen saturation level, and in certain cases, performing an action based on that determination. Particular aspects include a monitoring system having at least one pressure sensor for detecting air pressure in an environment proximate the at least one pressure sensor, and a processor coupled with the at least one pressure sensor, where the processor is programmed to receive air pressure data from the pressure sensor about the environment, determine an oxygen saturation level for a user in the environment based on the air pressure data, and in response to determining the oxygen saturation level of the user has met one or more predetermined conditions, perform an action.

Abstract: Aspects of the present disclosure provide multi-layer microphone protection for any apparatus that captures sound. The apparatus includes an enclosure defining a first cavity. A microphone element is coupled to the first cavity. The microphone element comprises a microphone sensor and a microphone cavity. A first, outer protective layer is disposed at an outer end of the first cavity, closer to the external environment. A second, inner protective layer is disposed between an inner end of the first cavity and the microphone element. The second, inner protective layer may protect the microphone sensor from particles or liquids that may have passed through the first protective layer. The first and second layers may have different acoustic properties.

Abstract: Aspects of the present disclosure provide multi-layer microphone protection for any apparatus that captures sound. The apparatus includes an enclosure defining a first cavity. A microphone element is coupled to the first cavity. The microphone element comprises a microphone sensor and a microphone cavity. A first, outer protective layer is disposed at an outer end of the first cavity, closer to the external environment. A second, inner protective layer is disposed between an inner end of the first cavity and the microphone element. The second, inner protective layer may protect the microphone sensor from particles or liquids that may have passed through the first protective layer. The first and second layers may have different acoustic properties.