This is the Stereo Coffee 3 stereo input, 1 stereo output  Light Dependent Resistor Attenuator kit. "The A3 edition "

The third image shows the "Direct" option which features mosfet optocouplers for switching the series anodes, see separate listing for Stereo Coffee "Direct"   

All boards are fully assembled for you, just requiring wiring between boards , and some minor soldering.  24//7 help available where required

Every audio system needs some means of volume control, rather than passing audio signals through potentiometers, (you may have heard scratchy sounds with these types)  The kit instead replaces normal volume controls with Light Dependent Resistors , that not only vary volume with more or less light intensity, but are also contact-less switches, for the three inputs.  A much improved audio experience awaits.  

A3 boards are fully built and tested. 

The kit comprises a main board that accepts power supply of 12vAC , a LDR board with 8x NSL32SR3 matched LDR's , a switch for the LDR anodes that enables contact-less signal side switching, either choose a manual Bourns potentiometer, or  a remote volume board * for volume adjustment.

*Remote volume boards are at times limited in stock, but will be supplied when available, even if requiring separate shipment.to you, in such cases the manual board is supplied initially to get you going.

You will need suitable casework,  The A3 model requires  2x 12v AC supply that can be a plugpack types , RCA sockets and a connector for the 12vAC supply a set of screwdrivers , a soldering iron is needed for connection of the potentiometer and volume control. * Remote volume boards are pre-wired for you

24/7 message assistance is available, to help you with construction if needed.