When you snap the headset into the portable charging unit, it automatically shuts off and begins to charge. The charging unit holds up to three full charges. It has a battery status indicator and a Micro-USB charging jack. The Stone also comes with a belt clip, which you can attach to the charging unit.
The Jabra Stone has typical headset features like answering, ending, and rejecting calls, last number redial, call mute, voice command support (if available), and the capability to transfer calls from the headset to the phone and vice versa. It also has multipoint technology, which means it can connect to two devices at the same time. We also like that it has A2DP streaming so you can listen to music from the music player on your phone. Of course you won't get stereo sound with a mono headset, but it's good enough for a quick listen. The Stone also has a low battery warning--it'll let out two short beeps indicating you have only 10 minutes of battery.
We tested the Jabra Stone with the Apple iPhone 3G. It automatically goes into pairing mode when we first powered it on, and we didn't even need a PIN to pair it (this may vary depending on your phone, however). Call quality was just OK. We tested the Jabra Stone in a quiet office, in a moving vehicle, and inside a busy cafe. In all the situations, we heard our callers without a problem. We did hear a bit of static and a high-pitched hum occasionally, but it wasn't too distracting. Volume was good, and we thought callers' voices sounded quite natural.
On their end, callers reported good call quality when we were in a relatively quiet environment. In the quiet office and in the moving vehicle, they could hear us just fine. They did detect a bit of echo and said our voice sounded a little harsh and robotic. They also picked up some road noise and radio music when we were in the car. But in both cases, we could still carry on a conversation. It was a bit more difficult in the noisy cafe. We found we had to raise our voice at times in order to drown out the environmental noise. The call quality wasn't terrible, but it's still not as good as we would have liked.
The Jabra Stone has a rated talk time of up to 2 hours on the headset alone, with an additional 6 hours if combined with the charging unit. It has a rated standby time of 12 days.