Used Once Open box Sony XM4 with everything (all accessories and pamphlets included). Unfortunately, my head is big so it was a very tight fit. Used once and absolutely fell in love with the sound. I ended up buying a used XM3 because similar sound but better for bigger heads. Listen to tunes in peace with these Sony headphones. Their noise-canceling processor blocks out background noise so you can fully enjoy your playlist, and the Smart Listening feature adjusts noise-canceling levels based on your activity. Quickly charge these Sony headphones in only 10 minutes to provide 30 hours of battery life. Industry Leading Noise Cancellation. *As of August 30, 2018. According to research by Sony Corporation measured using JEITA-compliant guidelines. In headband-style of wireless noise-canceling headphones market.