... cable 2.USB cable 3.FM radio, earphone function Features: speaker car audio can link to iPad, MP3, MP4, Notebook, CD, DVD ... equipped with 3.5mm audio jackEach speaker contains built in amp powered by rechargeable batteryIncludes speaker cable with USB plug for charging ... : AC 120/230 V ( 50/60 Hz )· Impedance: 8 ohms . speaker car audio