Hello and thank you for looking! 

This auction is for one assembled preamp board. The board will come with basic installation instructions for connecting to your D-104 microphone. Some electronics knowledge may be required depending on your installation as we cannot cover all configurations in the instructions. If you have any questions feel free to send us a message before bidding. 

This auction is for the preamp board only. The microphone IS NOT included. 

Disclaimer: If you do not know how to properly install this board into your microphone we suggest you bring it to a qualified radio technician as we are not liable for improper installation. 

Here is a video showing the performance of the preamp. https://www.youtube.com/watch?v=CAz6P78YIKo&feature=youtu.be