<ul> <li>Audio drivers - kb-200 bluetooth headphones use a strong 40mm dynamic driver...<br /><br /></li> <li>Charge &amp; go - for the best entertainment experience we use a long-lasting battery which can play music up to 20 hours...<br /><br /></li> <li>Kid-friendly headphones casing: the casing is very lightweight...<br /><br /></li> <li>Bonus carrying case: comes with a storage case for your headphones when not in use...<br /><br /></li> <li>Item dimensions: 8.5 x 7.5 x 2; weight: 0.5 lbs</li> </ul>