I'm sorry to say that this product falls short of the mark by being unable to perform its primary function i.e. to listen to the people who phone you!.
I purchased a Panasonic headset to go with a Panasonic phone system and thereby ensure compatability. However, even when I adjust the volume on the phone to its maximum level the volume in the headset is still so quiet that it makes it virtually unuseable. It's a shame really because apart from this serious lack of volume it is quite well made.
Buy the Plantronic M175 headset, it works well, has volume and mute controls and is more comfortable.