Appliance:Teaching,Speech, guide, exercise, promotion, music, personal karaoke etc                    • Patented design, streamline appearance, ergonomic • Set Microphone,speaker,Karaoke,recharger in the voice amplifier •Use BTL power amplifier technology •Multi-using acoustic theory and technology of digital frequency shift,so making more super clear quality and screaming inhibitory ability. •Using intelligent power management system, full automatic monitoring charging power, not only can effectively protect the rechargeable battery long life, but also higher efficiency. • Independent power switch and the volume control, it is more convenient to operate, and thoroughly solved traditional product murmurs, etc