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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Microphone Features Measures 21′′ Long High Directivity Line + Gradient Polar Pattern Switchable 80Hz High Pass Filter 10dB Pad Switch +48V Phantom Powered The BP4071L Line and Gradient Condenser Microphone from Audio-Technica features an extended length of 21′′ that maximizes directivity and narrows the pickup area. The result is focused audio capturing and minimal noise and artifacts from sources outside the pickup area.
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The Movo Photo PM10EC6 is a high-quality microphone extension cable that offers 20' of additional length between your mic's 3.5mm TRRS connector and the 3.5mm headphone jack of a smartphone or tablet. The PM10EC6 is compatible with both iOS and Android devices and can be used with smartphone-ready microphones from Movo Photo as well as other manufacturers.
Movo PM10EC6 20-Foot (6m) TRRS Female 3.5mm to TRRS male 3.5mm Microphone Extension Cable for Smartphones