I purchased this product to replace my lost plantronics 645. I have used these products for handsfree driving. The plantronics was good in sound but had a flimsey wire attachement for ear hook. the wire often became unattached and the phone was constantly falling apart (Finally out the window on the freeway).This Jawbone overcomes this and fits perfectly. The sound is clear and the battery lasts longer. It even came with a plastic stand that I set up on my car console to hold it when not driving, another plus. Perfect and exactly what I have been looking for.Now if it just had a police radar scanner built in..............