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. 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: 5.25. 2 x 1. Impedance: 2 ohms . Frequency Response : 90Hz-20KHz. Built-in Rechargeable 1200mAh/3.7V Lithium Battery. Power Output: 9W. S/N Ratio: 60dB . Mic Input (1 wired mic included). Complete Portability Allows You to Use Your Unit Indoors & Outdoors.