Via proprietary 14.2-mm drivers, the DeepBass powered WHS-200 and WHS-600 headsets deliver deep sound with extremely low THD. The WHS-200 is an open in-ear headphone for all mobile apps, i.e., music, videos, games, etc. The WHS-600, a sealed in-ear headphone, promises accurate low-end performance without sacrificing high-frequency detail. Both units feature AAC ID8's Bassport technology, which enables the drivers to perform like subwoofers. AAC Technologies Holdings Inc., Shenzhen, China. +86 755 33972018/86252088.