These are the most uncomfortable bluetooth headset around. Very poor sound quality with constant hissing and very bulky. Sports headset? You cannot run on the treadmill with these because if you turn your head the headset with scratch your ear and fall out. You cannot weight lift on bench because the headphones will pop out when you lay down from the headrest. You cannot DO ANYTHING BUT SIT STILL WITH THESE uncomfortable tight headset on your head. Anyone with glasses should never purchase any headphones or headset that goes around the ear. S9 or most products from motorolla do not seem to have too much thought in the design. HMMM... let see most techno geeks wear glasses so WHY would you design products that go around the ear ???