Portable Wireless Audio System. Speaker Deliver Clear Crisp Sound. LED Display. Built-in 2.1 BT Compatible Allows You to Wirelessly Connect to BT Enabled Devices. Built-in USB Input. Built-in Micro SD Card Reader. Built-in Recorder. While it Works Flawlessly with Any Compatible Stereo BT Device, the Speaker Also Allows for a Wired Connection Via its 3.5mm AUX-in Port for Other Portable Devices without BT Connectivity. Karaoke Function with One Microphone Input. FM Radio. Driver: 6.5" + Piezo Tweeter. Impedance: 4 ohms. Frequency Response : 70Hz-18KHz. Built-in Rechargeable 2100MA/11.1V Lithium Battery. Power Supply: 1.5A/13.5V Adapter. Shoulder Strap Included. Full Function Remote Control. Complete Portability Allows You to Use Your Unit Indoors & Outdoors.