This is the model for computer soft phones. The base station plugs into the USB port of your computer which both provides power and connects to your PC as a hardware item.I decided to purchase this because my old plantronics plt battery was only lasting a couple of hours and I often have conference call after conference call from my home office every day. I use it with basic Skype for which I subscribe with a phone number and call plan etc.So, the important things for most buying this:1. range (facilitated with DECT technology) is excellent, I can go make a coffee, answer the door etc. whilst on the phone. An added bonus is that there is a mute button on the headset which was not possible with my old PLT - I often found myself rushing upstairs to go off mute in mid tea making. That issue is now resolved.2. Battery may degrade over time but my initial experience is that this will last a work day. There are 4 bars to display battery status on the base station and I have only got down to 3 after several hours on the phone. When you put it back on the base station, it recharges super fast. Lastly on battery, I was concerned the battery would drain when I turn my computer off overnight or over the weekend and so no power is going to the base station. That does not appear to be the case; I suspect the headset knows this and turns itself off - on a Monday morning on PC boot up, I see 4 bars.3. Sound quality is fine, I don't think any better or worse than my old PLT.4. Comfort: This comes with a head band but sales literature suggests you can also use it with out the head band with a loop around the ear. This is a little misleading and is why I have knocked a star off. If you want to use without the head band you need to purchase a $15 "super loop" accessory which is available on headsetsdotcom but not currently on amazon. That said I am use to the head band now and quite like it, it's just not as tidy on my desk as the PLT.Last point is on the seller. Headsetsdotcom are fantastic and clearly focus on customer service. When I raised the issue around not having to use the head band with them directly on their website via chat, the lady knew exactly what I was talking about and resolved the issue in a mutually conducive way regarding the super loop.Still a big fan of plantronics - just bought some blue tooth exercise ear buds but, these sennheiser came in a little bit cheaper and offer a slightly better proposition in terms of configuration, features etc.So far, they have been a great buy.