Fortunately bought at 150 instead of 300. Device junk. We must resynchronize every 15 days (10 minutes each), there is a latency on the volume (you turn the knob to edit sound, it nothing happens ... then it screams you in ears ...). The only interest, your smartphone (once you have the retimed while your friends without toast) is a remote control! In short, I regret not choosing (and paid for) a more reliable brand ...