The StageBug SB-5 is a stereo direct box that has been specifically designed to interface your laptop, tablet, smartphone, or music player with professional audio systems. It features an integral cable that is terminated with a standard mini TRS connector along with a cable cleat for easy storage. Using the SB-5 reduces noise, enables long cable runs, and improves sound quality by properly matching the impedance and optimizing the signal level of your mobile device to work with a PA system. The cool thing about the SB-5 is that it does not require any power whatsoever to make it work. It is passive. The magic comes from two custom-made isolation transformers that do all the work.