The Go 660 combines Jabra's EXTREME Bluetooth headset — and yes, Jabra does spell it all in caps, presumably unaware of how odd one looks shouting into a Bluetooth headset — along with a USB LINK 320 Bluetooth dongle for those PC systems that lack Bluetooth. The basic idea is that the headset, which can pair with multiple sources, can be used to pair with your Bluetooth-enabled mobile as well as a desk-based softphone client. The use of the USB dongle isn't mandatory if your system already supports Bluetooth, but as long as you've got a spare USB port, any system should be upgradeable. The USB dongle is largely unremarkable save for the fact that it's rather bulky. We've seen truly tiny Bluetooth dongles before, and if you popped this in the side of an older non-Bluetooth-compatible laptop, it would stick out a lot.
Like many Bluetooth headsets, the Go 660 features noise-cancelling technology that utilises multiple microphones to clarify your spoken word. Jabra's take on noise cancellation is called "Noise Blackout". The headset itself comes with multiple comfort fit bands and caps, but we found it essentially ready to go out of the box. It charges via micro USB, but no direct AC charger is supplied in the box. Instead, you get a car cigarette adapter and a tiny micro USB to A-Type USB plug with a stiffly rotating head for charging from a standard USB port. The headset itself can pair with up to eight devices, although it'll only actually work with two of them simultaneously.
Pairing the Extreme headset with multiple devices is much like pairing any other headset, from powering it on and detecting turn by turn with each device. We combined testing between an iMac and a Windows 7 PC. We did hit some quirks with initial pairing, and not surprisingly it won't pair with two smartphones at the same time., , an
Call quality from various sources was mostly good. There's an obvious problem with testing any mobile device for call quality as factors outside the headset can affect the actual call, but in our tests all respondents could hear us clearly and we could hear them.