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.
https://www.amazon.com/HUACAM-HAS04-Sensitive-Microphone-Surveillance/dp/B00EGHY8KQ/ref=sr_1_8?s=photo&ie=UTF8&qid=1486903839&sr=1-8&keywords=sound+monitor+pickup+device



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:

http://www.amazon.com/Generic-10Meters-Security-Trailer-Reverse/dp/B00DVZYCMS/ref=sr_1_7?ie=UTF8&qid=1422580177&sr=8-7&keywords=rca++power+cable 

 

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

http://www.amazon.com/Yellow-Power-Female-Extension-Cable/dp/B00FH48JMU/ref=sr_1_2?ie=UTF8&qid=1443056089&sr=8-2&keywords=DC+++RCA+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 

https://www.amazon.com/uxcell-5-5x2-1mm-Female-Splitter-Camera/dp/B0050H9A18/ref=sr_1_fkmr0_1?s=photo&ie=UTF8&qid=1486906946&sr=1-1-fkmr0&keywords=5.5x2.1mm+1+Female+to+2+Male+Splitter+2+Way+DC+Power+Cable+8.75%26quot%3B+Length+for+CCTV+Camera

To know how connect an audio pickup device to camera without using its own power supply, please refer to the picture below.