MY551BT Bluetooth speaker offers a great quality sound with Bluetooth 2.1 technology. With the ultra-compact size and portable design;easily fits into your backpack;suitcase;or a travel bag. The built-in 2000mAh rechargeable battery enables over 10 hours of playtime on a single charge. It is ideal for personal usage;indoor party;outdoor BBQ or picnic with friends and family.Main Features:Handy Hands-free FunctionBuilt-in high sensitivity microphone. Free your hands and answer the phone timely.Excellent SoundAIBIMY MY551BT has an excellent sound quality;suitable for performing all types of music. 6W high-end low-impedance internal-magnetic speakers and the dual-driver make the sound distortion-free and clarity.Advanced Bluetooth 2.1 TechnologyIt features Bluetooth 2.1 technology to maximize device compatibility and pairing speed.maximum support memory capacity:32 GB