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A few years ago, I bought a Motorola KRZR, and the kind chaps at Vodafone bundled it with a free H670 that matched the colour. At first I didn't think anything of it, but I started to use it more and more as time went on, and then I got a car and started using it even more, for a while.
First thing you notice is, it is very lightweight. That would be because it's made of cheap plastic, it feels pretty cheap, and I would be a bit miffed if I had paid for one, but for a freebie with a phone, I couldn't complain.
It has a rechargeable battery, and connects via mini USB (this was the days before micro USB took off). If I'm honest, the battery life isn't brilliant. 2 or 3 trips out and it was dead.
Call quality isn't bad, but again not great. It's fine for most applications, although in cars with a lot of wind noise, it was quite difficult for the other person to hear me. I could hear them, although the headset sounded quite tinny.
The same went for listening to music. I did briefly play with the music functions on the phone and used this rather than a pair of headphones. Obviously, you lose sound quality when playing over Bluetooth, but here it was unlistenable; very tinny, with harsh treble and no bass whatsoever. But I appreciate that this wasn't designed for listening to music.
All in all, it was a good first headset, and I was reasonably pleased with it's performance considering it was given away free with the phone, which it matched the look of. That said, would I buy one, with money? Not a chance. Plus, times have moved on in the 5 years since then, so you'll get something much better here in 2012.
Motorola aligns top-notch connectivity with elite style with the H670 Bluetooth headset. Influenced by MOTOKRZR, the H670 headset is sleek and functional, offering optimal comfort and up to eight hours of talk time.