How to add a microphone for PLC-128SPW Hidden Pinhole Camera?
You can use a keyword sound monitor pickup device or monitor to search on amazon.com.
Here I give a link as follow for your reference.
Both 720 spy camera and microphone has a female RCA connector, you need a cable which it's two ends are RCA Male Plug. Please refer to the link below:
And if you want the microphone doesn’t need its own power supply,
so additionally, you also need a Male Plug Red DC Power Jack Male to Female Extension Cable ,please refer to the link below:
A Male Plug Red DC Power Jack Male to Female Extension Cable
Most audio pickup device sold on Amazon comes with a power adapter.
However, if you want the microphone doesn’t need its own power supply, you can power it using camera's power adapter with a 1 Female to 2 Male Splitter 2 Way DC Power Cable power supply for both cameras and audio, please refer to the picture below.
DC Power Cable Female 1 to 2 Male Plug and 2 in 1 cable
To know how connect an audio pickup device to camera without using its own power supply, please refer to the picture below.