I bought this for use with my new stereo capable MP3-playing cell phone and for use with Skype and audio from my laptop. I love the concept of this product: a small and convenient Bluetooth adapter allows you to listen to stereo sound with both ears plugged, or leave one ear open and talk on the phone. The mic is integrated into the tag and gives good quality to your side of the conversation.  The included stereo ear buds are also good quality for phone and music.  The tag/adapter/mic can be paired with any standard wired stereo headphones if you want to upgrade. Battery life is good.  It always lasts all day even with heavy use.  Two or more days is pushing it.  As the battery gets low it drops more frequently.