I have used this device daily for about 3 weeks. I was about to return it because I could not make it do what the instructions said. A search of the internet turned up the problem. The instructions were wrong. Hold the button longer than it says, and it works fine. Been perfect ever since. The audio is good. Not perfect, but very good. Certainly for car with road noise anyway. Battery lasts a long time between charges. Now I can listen to the music library I put on my cell phone. I love it. A little cheaper than an MP3 but sound quality that isn't much worse. Just remember, hold the button for more than 5 seconds, and it will blink green/red just like it says. Stupid instructions.