Newonline Waistband Tour Teacher Voice Amplifier Portable Microphone Speaker N74<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Built-in rechargeable lithium batteries that last for long continuous use </span></li><li><span class="a-list-item"> Frequency Response:100HZ ~ 13，000HZ ±1db </span></li><li><span class="a-list-item"> Max Effective Distance:400SQ.M. / 1200mAh Li-ion Battery or 18650 cells </span></li><li><span class="a-list-item"> AUX input for MP3 player or iPod </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41rM%2BILDZ1L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41R6iXqN9-L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/410sbFMhNIL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51ycVJSKY0L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51GY1SxFdOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/417WsfkK0wL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/411UbpRjE0L.jpg" noproxy>