Extra bass headphones for bass music Light weight up-to 21g Quick charge for 10 min for 60 min play back Battery life of 15 hours for long listening hours Built-in mic for hands free calling 12mm driver unit Support type C charging Support Google assistant via voice guidance features Product description The WI-XB400 are fully wireless, effortlessly portable and deliver deep, punchy sound. The headphones come with 15 hours of charge and a silicon neckband, so they'll slip right into your pocket or bag. Lightweight headphones with EXTRA BASS for a deep, punchy sound As part of the EXTRA BASS range from Sony, the WI-XB400 headphones enhance all of your low-end frequencies for exceptional bass, while maintaining vocal clarity, lifting every track with wave after wave of thundering rhythm.