features cordless design, which isconvenient to carry and will not restrict your movement, so that you are free from the interference of cluttered lines. It isperfect for stage performance, karaoke, public address (presentations, classes, conferences). Features: Adopts superior crystal plates and parts, has outstanding tone quality. Adopt special ALC circuit without worrying about excessive volume and sound distortion. Wide frequency response, high S/N ratio. Resist disturbing strongly, limit noise output. Cordless design, convenient and practical. Has high stability of frequency. Special noise reduction function. Low noise and large dynamic range. Adopts low voltage design, can work even in the condition that the battery voltage down to 3V. Using low power components, the b-attery has long use time. Has electricity quantity indicating circuit, which can remind you to replace the b-attery.