Function introduce: (product code: SMP-2412) ◆ Compact foldable design for easy carrying and storing wherever you go ◆ High quality audio output ◆ plug and play ◆ Used for all kinds of audio products (iPod, MP3, MP4, Notebook, CD) ◆ Volume Control ◆ Low power consumption design, 4 AAA batteries last up to 13 hours playback ◆ Power supply: Battery(4 x AAA batteries), DC 5V(USB Cable for PC), or AC Power adaptor(6V, 300-800mA) ◆ Speaker: 50mm × 2W × 2(4 Ohms) ◆ S/N ratio: ≥90dB ◆ Input interface: stereo 3.5mm ◆ Output power: ≥0.9W × 2 (1KHz, 10% THD) ◆ Frequency response:150Hz~18KHz