Completely wireless earphones with high waterproof and dustproof performance and built-in 4GB memory for various scenes Equipped with 4GB of memory. Enjoy approximately 920 songs with just the headphones (in the case of mp3 128kbps). New antenna structure, etc., realizing low latency and stable left/right connection Built-in microphone in the headphones to capture environmental sounds and human voices Newly developed BA drivers are used to achieve both sound quality and a compact body. Adjustable earpiece positions for a more personalized fit Includes three sizes of arc supporters to enhance wearing stability Dedicated "Headphones Connect" application Music Center" application for comfortable control of music stored in internal memory