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Mornings ,please could someone advise ,I have installed and Hikvision camera in a small office with a external microphone powered by 12v power supply within 5m range from NVR and Mic ,the problem is this it all worked fine and the audio was great now for some reason it stopped working ,I have...

I need some advice my client wants a pin hole camera outside in a wooden existing fence post ( 25 mm) need to be battery powered please