FULAIM WM500 UHF Wireless Microphone, with One Reciver and Four Transmitters for Interview Recording

Fulaim WM500 wireless mic:
1. One receiver and 4 transmitters;
2. UHF transmission technology;
3. 16 Selectable UHF Channels;
4. Built-in 1000 mAh rechargeable lithium-ion batteries;
5. Real-time Audio Monitoring;
6. Camera, Smartphone, PC compatible;
More details here:
Amazon US: amzn.to/3RkLLDB
Amazon store: amzn.to/3BU3H2n
Official store: bit.ly/3xXVBEA

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Do u need an app to track all 4 audio or can I simply connect it and use my iPhone camera