SOYO-WTG2009B newly developed by SOYO TECHNOLOGY DEVELOPMENT CO. LTD, is a Hi-Fi wireless digital tour guide loudspeaker system with very good resistance against various RF interferences. It is characterized by a lot advantages, such as small in size, highly integrated, high quality sound (with HDCD sound effect, the highest sampling ratio in the field of all our modules so far), broad input voltage range (2.36Volts), output power up to 60 mw, etc.