This mini portable Bluetooth speaker can bring you unbelievable clarity and clean sound. Enjoy your steaming music with many ways of connectivity to your speakers. Includes 3.5mm auxiliary input, Micro SD(TF) card, USB flash drive, and of course with Bluetooth connection. Built in rechargeable battery, you could easily enjoy playing music more than 2 to 3 hours.(playtime might vary in different environment). Work with nearly all samrtphones.