DJI Mic 2, Wireless Lavalier Microphone, Noise Cancelling, 48kHz 32-bit Float Internal Recording, 820 ft.(250m) Range, 18H Battery with Charging Case, Microphone for Camera/Phone, Vlog, Streaming

SKU: GW53.0107

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It is recommended to use the back clip of the DJI Mic 2 transmitter to secure it to places like your collar, or you can mount the transmitter using the DJI Mic 2 Clip Magnet. 
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No. DJI Mic 2 is ready to use without activation. 
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DJI Mic 2 transmitters each have 8GB of built-in storage that can record 24-bit audio for up to 14 hours or 32-bit audio for up to 11 hours. Transmitters do not support external storage. 
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You can use DJI Mic 2 with many devices, including cameras, smartphones (via USB-C/Lightning port or direct Bluetooth connection), computers, Osmo Action 4 (via USB-C port or Bluetooth), Osmo Pocket 3 (via USB-C port or Bluetooth), and Osmo Mobile 6. 
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250 m with FCC compliance and 160 m under CE (in an unobstructed environment without interference).