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How do I fix my bluetooth headphones? - bluetooth headphones programa

I have the Motorola MOTOROKR S305 Bluetooth headset. It worked fine until a few days ago. Well, if I try to play the music in them is no sound from the headphones. I think I pressed the mute button on accident (which, as the manual is the same as the play / pause button). When this happens, I do not know how to un-mute the music and not the manual tell you how. What should I do? Or should I looking for a new headset?