Function: FM Tuner: Built-in Interface: USB, microSD, AUX, Microphone (Karaoke), DC Support Bluetooth Wireless Playback Support Playback from MicroSD cards Support Microphone Input Battery Built-in: Rechargeable Li-ion battery 2000 mAh Specification: Model: HBPC-1602 Sound: Stereo Speaker: Diameter 5”(x2) + Diameter 2.5”(x2) Output Power: 15W Voltage: 7.4V Frequency Response: 2.402 ~ 2.480 Ghz