... radio,built-in Lin-ion 4.USB cable Features: This subwoofer speaker can link to MP3, MP4, Notebook, CD, DVD, Mobile ... .7)LED display, with remote control,Support FM radio (optional) 8)Dual power supply modes: built-in Lithium rechargeable battery & USB ... · Voltage Required: AC 120/230 V ( 50-18K Hz )· Impedance: 8 ohms· Output: RMS: 2*5W subwoofer speaker