★ Output power: RMS 3W THD = 10%
 ★ Frequency response :150-18000HZ (+ /-3dB)
 ★ signal to noise ratio: ≥ 80 dB
 ★ Speaker: diameter 45mm, 4 ohm shielded
 ★ USB retractable cable
 ★ Audio Size: 50 * 50 * 50mm
 ★ USB 5V power supply or adapter DC-5V power supply, can not be higher than 5.5v
 ★ special plug TF card. Retractable cable to the computer, Headphone
 ★ FM Radio
 ★ Built-in lithium battery)