the speaker to any laptop or notebook<br>● Built in <B><span style="font-size:14px;">volume adjustment control</span></B> of music<br>● No software or external power supply needed<br>● Powered by USB cable                 <strong>Model:</strong> M21 <br />             <strong>Design:</strong> Portable <br />             <strong>Compatible with:</strong> MP3 <br />             <strong>Supports:</strong> Loudspeaker,Volume Control <br />             <strong>Functions:</strong> AUX Function,Songs Track,Stereo <br />             <strong>Connection:</strong> Wired <br />             <strong>Interface:</strong> 3.5mm Audio,Micro USB <br />             <strong>Audio Source:</strong> Electronic Products with USB port <br />             <strong>Material:</strong> ABS <br />             <strong>Color:</strong> Black                               <strong>Support O.S:</strong> Mac OS,Windows 2000,Windows 7,Windows 98SE,Windows XP <br />             <strong>Power Source:</strong> USB                                            <strong>Package weight:</strong> 0.251 kg <br />             <strong>Package size (L x W x H):</strong> 13.00 x 10.00 x 6.00 cm / 5.12 x 3.94 x 2.36 inches                               <strong>Package Contents:</strong> 1 x Mini USB Speaker Audio Music Player                 <p><img src="http://des.chinabrands.com/uploads/pdm-desc-pic/Electronic/image/2016/03/18/1458298015909101.jpg" style="" title="1458298015909101.jpg"/></p><p><img src="http://des.chinabrands.com/uploads/pdm-desc-pic/Electronic/image/2016/03/18/1458298014924617.jpg" style="" title="1458298014924617.jpg"/></p><p><img src="http://des.chinabrands.com/uploads/pdm-desc-pic/Electronic/image/2016/03/18/1458298016960107.jpg" style="" title="1458298016960107.jpg"/></p><p><img src="http://des.chinabrands.com/uploads/pdm-desc-pic/Electronic/image/2016/03/18/1458298019289759.jpg" style="" title="1458298019289759.jpg"/></p><p><img src="http://des.chinabrands.com/uploads/pdm-desc-pic/Electronic/image/2016/03/18/1458298018421285.jpg" style="" title="1458298018421285.jpg"/></p><p><img src="http://des.chinabrands.com/uploads/pdm-desc-pic/Electronic/image/2016/03/18/1458298021104230.jpg" style="" title="1458298021104230.jpg"/></p><p><br/></p>