Even on larger headsets, the controls can be quite fiddly to use and so given its small size you wouldn’t expect the Stone to exactly excel in this area. And sadly, it doesn't. The Jabra logo on the outside of the headset marks where you need to press to activate its sole push button control. This acts as a multifunction switch. For example, a single tap picks up or drops a call, double tapping it redials the last number and holding the button down for a few seconds turns the headset on and off. There isn’t much travel on the button so often you need to rely on the tone that’s sounded when a button press is registered to make sure that you’ve actually pressed it correctly.
The outside face of the headset also acts as a touch slider to turn the volume up and down. As on Jabra’s stereo Halo headset, which also features a touch volume control, this is actually quite tricky to use when you’ve got the headset in your ear as you can’t actually see or feel where exactly you need to place your finger in order to accurately use the slider.
There are a couple of other downsides to the design as well. For example, the headset can feel a tad loose on your ear because the ear hook doesn’t really ‘grip’ the ear but instead tends to just perch on top of it. It didn’t fall out of place while we were using it, but it did threaten to on a couple of occasions. Secondly, as there’s no way to flip the earpiece around, the headset can only be worn in the right ear, which means it’s probably not a good choice for lefties.
On the plus side, Jabra has managed to cram quite a few features into the Stone's small frame. For starters, it’s multipoint compatible so you can have it paired with two devices simultaneously. For example, you could have it hooked up to a smartphone you use for work at the same time as a standard mobile that gets used for personal calls. The Stone also supports A2DP for wireless audio streaming from compatible handsets. This isn’t exactly a must-have feature on a mono headset, but it might come in useful for viewing some online videos on your phone or something similar, and the headset does combine the two tracks to create a new mono track rather than simply using the left or right channel of the stereo track.