S28 Portable Mini Metal Bluetooth Speakers with Fm Radio Hands-free Calls Support TF Card - Black S28 Wireless Bluetooth Speaker Support Answer Calling and TF Card Support TF card(micro SD TF card)with TF card slot,can play MP3 format files in the TF card Expanded Bass Xpansion system drives a fuller richer low-end response Larger 45mm driver delivers precise highs for superb sound Compatible with : For iPad / For iPad2 /For New iPad /For iPad Mini. For iPhone4/4s/5 For Samsung / Xiaomi /HTC And more phone