GOgroove SonaSPHERE Mini Rechargeable Portable Speaker with Enhanced Bass for Google Nexus / Microsoft Surface / Apple iPad / Samsung Galaxy Note 10.1 / Asus Transformer Prime / Motorola Xoom / Acer Iconia & More Tablets! Powerful, portable sound that fits in the palm of your hand! Pocket-size design goes with you anywhere. Recharegable lithium-ion battery provides 2-3 hours of continuous audio per charge Durable, rubberized design - BUILT TO LAST ; Compact design EXPANDS to deliver enhanced bass and sound dispersion; On-board volume control allows for quick adjustment Links together with other SonaSPHERE speakers to increase total system power and fidelity - INFINITELY LINK THEM TOGETHER! Includes USB charging cable and carrying lanyard - GUARANTEED QUALITY ** 3 YEAR WARRANTY**