Amazon.com: Digital Camera External Microphone Compatible with Nikon D3400 DSLR Digital Camera, XM-AD2 Dual Channel XLR-Mini Audio Adapter for DSLR's, Camcorders and Pro Video Cameras : Electronics
Best Microphones For Nikon D3400 Under $100 – Mecam.me
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Amazon.com: Digital Camera External Microphone Compatible with Nikon D3400 DSLR Digital Camera, XM-AD2 Dual Channel XLR-Mini Audio Adapter for DSLR's, Camcorders and Pro Video Cameras : Electronics
Nikon D3400 DSLR Camera with 18-55mm Lens Professional Bundle W/ Bag, Extra Battery, LED Light, Mic, Filters, Tripod, Monitor and More - Walmart.com
Nikon d3400 microphone jack (adapter)setting - YouTube
Nikon D3400 Camera External Microphone | Microphone Audio Jack | Microphone Adapter - YouTube