Sony Ericsson MBS-200 streams music from your phone via Bluetooth. Features - single Wireless portable speaker and Mutes if there’s incoming call. MBS-400 is more stronger than MBS-200, as it comes with 2 speakers and available in selected markets in Q4 2008. According to my view this is very unique and modern product which is easy to use and very econoimical. A lot of qualities are hidden in this product.Share and Enjoy!