It's the most comfortable to wear. The sound is unbeatable. The capability to have several profiles (phones) let you select which one you want to use with the headset and if Bluetooth is on, you have automatically set headset in that phone.The battery last at least all day long if you are a heavy user, or you'll have several days if you use it moderately.Combine this with the Jabra A210 and you'll enjoy wireless freedom with your 2.5 mm jack phone (even used with your home wireless phone).