I bought this because works for more than one device. Right out of the box, it did not work, only weird noises, I called customer services and it had older firmware. I had to update it and you talk about complicated!! However customer service was great, much better than most. Finally it works and I can hear well. No one can hear me or the sound made them so uncomfortable, they did not want to continue the conversation, even my mother! It has voice activation settings but neither of them worked for me. The buttons are easy to access, it's comfortable, small and less ugly than most. The Plantronics 510 is much easier to use to with multiple devices. I can't recommend this.