USB-powered (5V) speakers plug directly into your computer for portable convenience Turn the speakers on and adjust the volume using one simple control (located on the front of the speakers); volume control includes On/Standby Simple plug-and-play setup (no drivers needed); can be used with headphones via the 3.5mm jack connector Frequency range of 103 Hz - 20 KHz; 2.2 watts of total RMS power (1.1 watts per speaker) Measures 2.76 by 3.55 by 5.3 inches (LxWxH); weighs approximately 1.4 pounds;