Excellent product. Extremely light and very comfortable. I have used many headsets from the major companies and Plantronics is by far the best. The only complaint is the battery life is only 3.5 hours. However I can understand since the unit is very small causing the battery size to be small which means less runtime. - Bob

I'm using the discovery 665 for 3 days now and it's working really well.  My callers say they can hear me just fine and I even work around a coke machine at work the voice dialing with the headset works pretty good if your in a noisy place.  You may have to say the name of the person you want to call louder or maybe twice before the headset picks it up but over all it works great for me.  I used it in the van at work and at home.  I have yet to try it outside or in a shopping mall etc. My favorite features of the headset is the over all sound quality on both ends and the the fact that you can leave it on and charge it and you can use the AAA battery charger without having to worry about plugging anything into the wall.  And lastly it's light weight on the ear .  I hardly even know I'm wearing it after 6 or 7 hrs of wearing it.  My ear does tend to get a little soar inside but I can still wear it all day on most days without any soreness. My overall view I love this headset.  - Jordan

I love my 665 headset, I cant live without it. After misplacing my charger I called to order another one with no trouble the sales person knew what I needed and set it to me. - Felicia 

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