provides acoustic sound through the headphone. Aux in jack lets you play along with your MP3 player. No matter you are in the college dorms or travelling? you can enjoy your music at any time without disturbing other people.<br><br><img src="http://des.chinabrands.com/uploads/2015/201506/heditor/201506181809377964.jpg" alt="JOYO JA - 03 Mini Pocket Guitar Amplifier with Acoustic Sound" /><br><img src="http://des.chinabrands.com/uploads/2015/201506/heditor/201506181809373872.jpg" alt="JOYO JA - 03 Mini Pocket Guitar Amplifier with Acoustic Sound" /><br><br / ><B><span style="font-size:14px;">Features:</span></B><br>Acoustic sound through the headphone<br>Plug your CD or MP3 player in and play along<br>Small enough to clip to your belt or hang from guitar body<br><br><B><span style="font-size:14px;">Specifications:</span></B><br>Sound effect: Acoustic sound<br>MP3 input jack: 3.5mm port<br>Earphone jack: 3.5mm port<br>Powered by: 2 x AAA batteries (not included)                 <strong>Brand:</strong> JOYO <br />             <strong>Model  :</strong> JA - 03 <br />             Array             <strong>Package weight:</strong> 0.103 kg <br />             <strong>Product size (L x W x H)  :</strong> 8.9 x 7.7 x 2.6 cm / 3.50 x 3.03 x 1.02 inches <br />             <strong>Package size (L x W x H)  :</strong> 15.7 x 11.8 x 4 cm / 6.17 x 4.64 x 1.57 inches <br />             <strong>Package Contents:</strong> 1 x JOYO JA - 03 Acoustic Guitar Amplifier