How is the Sony Ericsson f21 speaker

Soaiy F21 sound is very good. Soai (soaiy) F21 outdoor square dance sound mobile bluetooth trolley speakers with wireless microphone k song home singing high power subwoofer 12 inch subwoofer F21 + 2 wireless microphone. Soaiy machine that is Sony Ericsson, is funded by Japan's Sony Corporation, Sweden Ericsson, respectively, 50%, was established in October 2001, mainly engaged in cell phones, multimedia series of products research and development and production.