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
Microphone Holder Camera Stabilizer Steadicam Hand Grip With Two Hot Shoe Mounts For Dslr Nikon D3400 For Canon Accessories - Photo Studio Kits - AliExpress
Nikon d3400 microphone jack (adapter)setting - YouTube