________ are built into smoke alarms and thermostats or available as small plug-in modules.

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Multiple Choice

________ are built into smoke alarms and thermostats or available as small plug-in modules.

Audio input is common in IoT devices, and microphones provide that capability. Microphones can be built into devices like smoke alarms and thermostats, or added later as small plug-in modules, enabling voice control and sound-based features without redesigning the device. The idea is to have an inexpensive, compact input device that captures sound, which is why the plural form “microphones” fits the statement best. A loudspeaker is an output device, not the input being described here, and combining both microphone and loudspeaker isn’t necessary for the general phrasing of this item.

Audio input is common in IoT devices, and microphones provide that capability. Microphones can be built into devices like smoke alarms and thermostats, or added later as small plug-in modules, enabling voice control and sound-based features without redesigning the device. The idea is to have an inexpensive, compact input device that captures sound, which is why the plural form “microphones” fits the statement best. A loudspeaker is an output device, not the input being described here, and combining both microphone and loudspeaker isn’t necessary for the general phrasing of this item.

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