Review on Enhance Your Audio System with the Music Audio Spectrum Analyzer Kit: USB 5V LED Fantasy Crystal Cube Level Display by Kenny Marozas

Simple, easy to use and easy to pair with a second one. I also liked the different modes it has. You have to appreciate this for the price and ease of use. You connect it to USB power and then split the signal through the headphone jack. There aren't many options for audio, but you can make it work with splitters, or if you have a real audio device with multiple outputs, you can just plug it into an aux output. The only negative I would say is the color choice for the top, it needs to go to red/orange on top and not green/blue, that's how it goes. That would be my only complaint, apart from being an inexpensive, very well-made goody for my computer.