Sanrio K song story children's eloquence art Bluetooth microphone practice language children's microphone
--Bluetooth version5.0 Built-in battery capacity500mAh-800mAh (inclusive)Signal-to-noise ratio≥70db Frequency response range20Hz-20KHzRated power5 Rated voltage3.7Dimensions83*70*232 Battery life3-6h (inclusive)Radio headCapacitor Whether built-in batteryBuilt-in battery