Appliance:Teaching,Speech, guide, exercise, promotion, music, personal karaoke etc Character: • Patented design, streamline appearance, ergonomic • Set Microphone speaker, Karaoke,recharger in the Lithium battery digital voice amplifier • Multi-using acoustic theory and technology of digital frequency shift,so making more super clear quality and screaming inhibitory ability • Output power can reach 10W, clear sound, fully meet the 50-1000 square meters space and outdoor use