SAMSUNG Sound Bar 2.0CH Speaker(SMS-S20B) For PC Computer, USB Power, Color Black Simple Design, Easy Interface Sensibility Volume Dial, Extra Foot Pad Intuitive Sound : 2CH Stereo Speaker, Unit Impedance : 4, Unit Size : 50 mm Power Supply : USB DC 5V / 0.5A, Power Output : 4W (2W + 2W) Frequency Response : 80Hz - 20KHz