Excellent and magical product for my use. I use this on my minimap its USB GALAXY Note 2 coupled with an OTG cable jack and 1 Male-Male 3.5mm Jack or 1 / 2RCA for better sound quality and much more power when I plug or on a Audio Dock or in my vehicle. The sound delivered is actually much more powerful and what quality! From a small device is bluffing. You can increase / decrease the volume but also cut off the microphone output, but beware, the diode is "blinding." In the box you will find a PC install cd (not used to-day), a user guide and a small USB cable. Sending very clean and fast. I am the 2nd article of this brand, the first being an HDMI switch. Everything works great.