The iPhone audio is actually pretty decent for a phone, but if you are regularly recording interviews, videos or podcasts, you'll definitely want to
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The Saramonic SR-C2002 is a short adapter cable with an Apple Lightning connector on one end and an 1/8“ (3.5mm) TRRS female jack on the other. It lets you easily connect TRRS microphones, wireless receivers, mixers and other audio gear directly to the Lightning port on an Apple iPhone or iPad. Plug-in power is provided, which makes it compatible with a large number of microphones. The SR-C2002 can also add a fully functional headphone jack to an Apple device that lacks one.
Saramonic SR-C2002 Apple Lightning Connector to Female 3.5mm TRRS Audio Jack Adapter Cable 3
Flexible Mini Microphone for Smartphone Voice Recorder 3.5mm TRS TRRS Jack Plug
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Adaptor Cable for Mobile Devices #403871