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‘Well, we actually used miniature electret condenser mics,’ Vale explains.
The electret microphone (range, 20 to 25,000 Hz within three decibels) was fixed in a polyester cover.
Typically, all of the passive devices, except electret ion detectors, are available in hardware stores or by mail; electret ion detectors are usually only available through laboratories.
There are mini headphone and microphone jacks - the unit includes a pair of headphones with a tiny electret mic attached on a boom - and a proprietary USB jack with cable supplied.
A small electret condenser monaural microphone is found on the top panel next to its speaker, so you can annotate each image with your own voice.
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