New 2015 Portable Mini portable Bluetooth speaker subwoofer Wireless Speakers support SD Card for all Bluetooth Devices and mp3 player Gold Wireless Bluetooth Speaker Support Answer Calling and TF Card Support TF card(micro SD TF card)with TF card slot,can playMP3 format files in the TF card and Mobile Phone/Laptop/Tablet PC Expanded Bass Xpansion system drives a fuller richer low-endresponse Larger 45mm driver delivers precise highs for superb sound Built in rechargeable battery,charged by computer via USB interface.