I bought this headset to work with my Audiovox SMT5600, not listed by Jabra as compatible, but I took the chance anyway. The headset, which I purchased online, arrived with no instructions, but did include the charger, charger cord, belt hook, and several earbuds. A quick search online discovered the manual and pairing was accomplished shortly thereafter. All functions of the headset, including vibrating ring and voice dial, work with my phone. Sound quality is generally excellent -- it's at least as good as the phone's earpiece. All bets are off if you're out in the wind or driving with the window down, precisely the same conditions under which you can't hear the phone's own earpiece either. External noise such as a crowded restaurant doesn't seem to be a problem for my combination of phone and headset. The short boom mike seems to be acceptable -- nobody has complained they can't hear me. In fact, I can talk pretty softly under most circumstances and be heard just fine. External noise such as a crowded restaurant doesn't seem to be a problem for my combination of phone and headset. The battery is advertised to last a long time and it does. I haven't measured any run-down times, but the headset needs to be charged less often than the phone, which with bluetooth on needs a charge every couple days. The headset is light and, for me, comfortable; after wearing it 12 hours a day for the first several days I forget it is there. The headset is reversable by the simple expedient of rotating the earbud. The dorsal sping of the headset contains one button and one rocker switch. Because of the location of the switches they do not need reversing. The rocker controls volume up and down; the button combines on/off and answer/hang-up. Press the button to answer or hangup, hold for about 5 seconds to turn off/on. My phone hangs up when the other party disconnects and conveniently, so does the headset. The headset slips into the charging cradle like a knife into a holster. An accessory clip attaches to the charging cradle so you can hang the cradle (unplugged, of course) on your belt or waistband to carry the headset when it's not being worn. With practice, the headset can be put on with one hand. There is no provision for charging in an automobile, which would be inconvenient were battery not so long-lasting. Just pop the headset into the charger in the evening and you're good for the next day. On an extended trip the charging cord and cradle must accompany the traveler.  Other than the lack of a car adapter, which can be remedied aftermarket, my only complaint is that the headset is somewhat wobbly on my ear and the ear bud occasionally works itself away from my ear canal. This is not always immediately apparent until a call is made/received. This is aggravaated by the fact that there is no way to adjust the headset, it being constructed of a plastic shell with a soft lining against the ear. Even the flexible shaft holding the ear bud does not adjust side to side.  The headset is rated for up to 30 meters; this does not include walls or other obstructions. Jabra recommends you wear the headset on the same side that you carry your phone. Practice proves this. Lack of adjustability aside, this is a good headset with outstanding battery life. It's available at a reasonable price and, thus far, no other headset has wooed me away.