Completely redesigned with new and improved features such as durable build quality Aptx technology for crystal clear audio and built in battery meter. Designed to work as a Bluetooth wireless adapter for the Audio-Technica ATH M50x professional studio headphones. Some new features include, crystal clear audio with Aptx technology giving you professional audio quality while remaining wireless. New 180 mAh battery design enables longer use and more reliable for the long term with built in battery meter. Durable build quality with rubberized exterior to help shield it from accidental dropping