Plantronics Discovery 665 Bluetooth Headset

Bluetooth headsets are like sneakers, wristwatches and handbags; everyone has their own set of personal criteria when it comes to choosing one. Some people want a headset that is tiny. Some prefer wearing their headset by an ear hook instead of an in-ear bud. Some want the headset to be flashy, while others just want to blend in with the crowd. But when it comes down to it, everyone wants a headset that is easy to use, comfortable and of course, sounds great on both sides of the conversation. Today’s Bluetooth headset review is for the Discovery 665 from Plantronics.

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Hardware Specs

Talk Time: Up to 3.5hrs
Standby Time: Up to 80hrs
Charge Time: 3hrs
Range: Bluetooth standard 10 meters
Headset Weight: 9 grams
Battery Type: Lithium Ion Polymer
Version: Bluetooth 2.0

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Package Contents

Discovery 665 headset
12V car charger adapter
USB charger adapter
Charging pocket
3 ear gel tips
Ear loop
User guide

At first glance, you see that the 665 isn’t a flashy headset. This is one that both men and women can wear without hearing snickers from people they pass on the street.

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Made of shiny Black and matte Silver plastic, the 665 is approximately 2.25″ x 0.65″. On the face of the headset there are 3 buttons. Separate volume up/down buttons and the power / pairing / call pickup/end, etc. button. The Power button is surrounded by an LED that blinks Blue when powered on and alternates Red / Blue during pairing.

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If you flip the headset over, you will see the removable gel ear tip and the battery charger connection point (Black rectangle).

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The Discovery 665 comes with 3 gel ear tips of different sizes. They are made of a soft silicon material that I found to be comfortable to wear for extended periods of time.

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These ear tips are different than most I’ve seen before. They have a small plastic insert that allows them to snap into the headset and actually pivot up and down to adjust the fit. If you prefer to use an ear hook, one is included with this headset.

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Installing it is a simple matter of pulling off the ear tip, placing the ear hook loop over post that the ear tip connects to, and re-seating the ear tip. I found either method to be comfortable, even while wearing glasses.

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Like most Bluetooth headsets, pressing the buttons while you are wearing it, tends to feel awkward and sometimes a little uncomfortable. The Discovery 665 was no different in this respect. I wish someone would come up with a slider style volume adjuster for headsets, instead of the individual buttons.

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One of the best features of the Plantronics Discovery 665 Bluetooth headset is what they call the charging pocket. It’s a strange name for a pen cap style case / charging cradle that is included with this product. The headset slides into it for both storage and battery charging through USB or your vehicle’s power port.

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Here you see it snapped on the 12V vehicle adapter…

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And here it is with the special USB cable attached to it. Another nice feature is the fact that if you are charging the headset and a call comes in, the charging pocket will light up. Your call will automatically answer when you pull the headset out of the pocket. It will hang-up automatically when you return the headset to the pocket. I think this is a pretty clever design, don’t you agree?

In use, the headset works well. I did all my testing with a Treo 680 and didn’t have any problems pairing with it. All of the features worked as advertised except for voice dialing, which Treo’s can’t seem to do.

Below are two audio clips of the 665 headset in action. This will give you an idea of what it sounds like to receive a call from someone using this headset. I used the free voicemail / fax service from for these tests. I signed up for a free account, got a phone number and called it using a Treo 680 while using the Plantronics Discovery 665 headset. The resulting voicemails are then emailed to you. Pretty nifty! At test time, the phone had full signal strength. Click to listen.

Inside Test (366k .WAV file)
Outside Test (250k .WAV file)
Driving Test (181k .WAV file)

One of the main feature points for the Discovery 665, is its AudioIQ sound technology. It’s sort of like the Aliph Jawbone Bluetooth headset special noise cancelling feature, but on a much smaller scale. Their advanced digital signal processing automatically adjusts the voice levels so that they can be heard on both ends of the call. I asked several people what they thought about the sound quality when I would call them with this headset. Everyone said that I sounded very clear. On my side of the conversation, things sounded equally as good.

The AudioIQ feature does appear to work pretty well because at one point when I was talking to my sister while driving, I asked her if she could hear my car radio which I was playing at about medium volume. She said the only time she could hear it in the background was when I was not talking. Later I tried talking while I was holding a running hair dryer. Unlike the Jawbone, that noise was not filtered out.

Although I didn’t have an issue with battery life, this headset is only rated for 3.5hrs of talk time. That is pretty short when compared with several other headsets I’ve reviewed in the past that are 6-10hrs or so… If you’re a chatty Cathy, this headset might only get you through 1 day per charge, unlike myself, I can go at least 2-3 days per charge.

The Plantronics Discovery 665 Bluetooth headset won’t block out jack hammers and vacuum cleaner sounds while you’re talking to someone, but it does block out some background noise and produces clear conversations on both sides of the headset. The price for this headset is a bit on the high side at $149.95, but the addition of a carrying ‘case’ and 2 charging options does help justify it.


Product Information

  • Very good sound quality
  • Car and USB charger included
  • Comfortable
  • Easy to use
  • Expensive

4 thoughts on “Plantronics Discovery 665 Bluetooth Headset”

  1. Gadgeteer Comment Policy - Please read before commenting
  2. Thanks for a great review again!

    Now the only thing missing from this amazing product seems to be MultiPoint Paring. I’ve been a long time user of a Jabra JX10, and I’m loving it. I’m however looking for an easier headset to cary when not wearing it (the Jabra is flimsy to cary and I’ve actually broken multitude of earloop… good thing Jabra supplies replacements for free :p), but more importantly, a headset that would allow me to pair it to my Blackberry as well as the new Nortel IP set that they installed at our offices.

    As far as I could see, only Plantronics was actively embracing the MultiPoint Pairing feature. Unfortunately, further research on the the Plantronics site revealed that they did not cary this feature through all models of the Discovery lineup… :confused:

    Well, I’ll keep looking…

  3. I have one of them myself now, and my thoughts are as follows:

    1) I -love- the size of the thing, as well as the flashing LED indicator to indicate a missed call. The features like pulling it out of the cradle to answer and putting it back in to hang up are little touches. Two less button-presses, and it means I don’t have to think about how to answer the phone. The worst part about this, however, is that it DOES take an extra second or two to ‘pick up’ the call when you do it this way.

    2) The earpiece is a weak point – the eargel there has a really weak, IMO, retention mechanism, one which flies off if you pull at the thing wrong, and the way the earhook slides onto it means that if the earhook gets caught on something, the bud will inevitably go flying because the retention ‘clip’ is very, VERY weak. I think I broke mine with one such accident, as it got caught on a pen-stylus I was wearing in the same pocket. The bud still fits in the earpiece, but one flange of two, which serve to keep it clipped in, is missing.

    3) Volume’s very good, the microphone’s okay, but the sound cancellation could be better. It’s definitely no Aliph, but it does the job better than my old Samsung WEP200, and is far louder.

    4) Battery life is just awful. I don’t count the AAA-charger as being a good way to extend the battery life, unless you’re away from USB ports or a wallcharger a lot; because you have to turn it off to charge, you can’t use it to answer calls quickly when one comes in – it has to turn on (3 seconds of holding down the button), pair up (another 2 seconds), and then pick up the call (2-5 seconds). Even then, about half the time I’ve found that neither the other side or I can hear one another, even if the phone shows it’s paired (and sending audio) to the headset; it’s like the phone’s on mute on both the mic and the earpiece.

  4. I’ve been using this headset extensively for the past 2 weeks. I’ve had a couple incidents during that time where there was a problem with my side or the other side of the call not being able to hear the other person. Other than those couple of incidents, this headset has performed very well for me. It’s actually my new favorite. This is mostly due to the fact that it is small, easy to use, comes with 2 charging methods and is comfortable to wear for hours on end.

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