Ultra Portable Wireless Bluetooth Speaker : Louder Volume 12W+, Super Bass, Highly Portable Super Bass Sound Quality: The speaker includes up to 12W+ dual acoustic drivers and two-channel enhanced bass module to provide strong bass without distortion even at highest volume. • 2. Portable Audio Player: Easily to carry whether you're lounging around the house,or walking out. Designed to be comfortable to carry with no square edges and Ultra portable Under 15 ounces, quick and easy storage, which makes travel more easier. • 3. Battery plays: Built-in 1800mAH rechargeable lithium battery provides up to 12 hours of playback and can be easily recharged. 2-3 hour charge can bring 12 hours of Carnival. • 4. Bluetooth 4.0 Technology: Compatible with all Bluetooth-enabled devices (Bluetooth V2.1 and over) from up to 33 feet away. It can be reconnected automatically to the last device used. • 5. Multiple Features: Built-in microphone for hands-free speaker phone calling. Easy to pair and non-Bluetooth devices using included 3.5mm AUX-IN jack. Unique design of the Micro SD could support max 64GB and use the USB cable to download the file in your TF card.