Connect the power to the transmitter. ;)Niveau qualité du packaging, rien à redire non plus. I need to find a replacement again now. These ear buds are even better! The battery life on these amazing portable speakers isnt that great. the Sony are bulky and look geeky. Also, the button that you push to enable the unit to rotate is really difficult to use. No matter how hard I workout, I just dont sweat that much. But, I could easily hear ambient noise and hear people talking sitting next to me. He also has wide feet and these fit perfect with no readjusting needed.