Not at all impressed with this item. The first one I received was defective. As soon as a USB cable was plugged in the blue light went out. I checked my cable, & device. They checked good. So, I just plugged in the cable only, & the light went out again. Sent info to SONICELECTRONIX,7 they sent me another one.(thanx for the quick service Sonic) The replacement one I received did the same thing! However, when I moved the USB connector the light can back on, & unit worked. There is something wrong with the connections in the USB connections. Buy at your own risk.