1. S28 Wireless Bluetooth Speaker Support Answer Calling and TF Card2. Support TF card(micro SD TF card)with TF card slot，can play MP3 format files in the TF card3. Support Mobile Phone/Laptop/Tablet PC 4. Expanded Bass Xpansion system drives a fuller richer low-end response5. Larger 45mm driver delivers precise highs for superb sound6. Built in rechargeable battery，charged by computer via USB interface.7. Compatible with : For iPad / For iPad2 /For