As you would expect, pairing the headset with your phone is a piece of cake. All you've got to do is press and hold the multifunction call button for seven seconds until the headset's LED starts to blink blue and red. It's then simply a matter of doing a search for the Duo on your mobile and entering the standard '0000' Bluetooth passcode.
Once connected, the call controls are pretty straightforward. Tapping once answers or ends a call, and if you're on a call and hear the call waiting alert you can press and hold the button for three seconds to connect to the new caller. The headset also has a neat voice alert feature where it will speak to you to let you know if pairing failed, it needs a recharge or if the headset is disconnected from your phone as well as various other alerts.
When used as a standard headset, call quality is pretty good. Callers sound loud and distinct through the mono earpiece while the mic delivers clean audio for the most part. However, callers did note that the mic tended to pick up a fair degree of background sounds in noisier environments, which isn't really all that surprising as the headset doesn't include any noise cancelling technology.
Our course, the sound quality from the stereo headphones is just as important and on this front the Duo scores pretty highly. The phones use sound isolating in-ear buds which help to block out a lot of background noise - handy on tube journeys in London. The ear buds produce a decent amount of bass and have a pretty solid mid-range, plus the highs tend to sparkle nicely. However, when you push the volume to higher levels a touch of distortion does tend to creep in.
Unfortunately the integrated SRS Wow HD sound enhancement technology wasn't up to much cop. The pop, jazz and classic settings tended to boost the mid-range so much that the sound was very tinny and unappealing, while the Trubass function didn't really add any more bass, but instead simply created a bit of extra stereo width. Overall, we found it was a much better idea to simply leave the SRS off, which was a tad disappointing.
Battery life wasn't wonderful either. It takes around three hours to fully charge the Duo via the supplied wall charger and once it's fully topped up with juice, Bluetrek says it's good for around six hours of talk time or around four hours of music streaming. During our test period we got around five hours of talk time from it and around thee and a half hours of music streaming.
The Bluetrek Duo Stereo on the whole is a fairly decent performer. It works well as a headset and the sound quality from the supplied headphones is also impressive. However, it does look a little odd when you're using it as a pair of headphones and battery life could have been better.