Rosewill Wide Range Wireless Speaker RLT-SP-01 Subwoofer included Frequency Response: 80Hz-14KHz Transmitter Power source: Four AA batteries or DC 9V, Speaker Power source: Batteries or DC 12V Nominal Impedance 4 ohms Receive signal up to 100feet Tweeter power: 3W, Subwoofer power: 12W, Subwoofer size: 5"