AC-powered (10W) wired computer speakers plug directly into a wall outlet for maximum power Turn the speakers on and adjust the volume using one simple control (located on the front of the speakers); volume control includes On/Standby Plug and play―simply plug in the power and insert 3.5mm jack into your audio device; built-in headphone jack on front of speaker for easily plugging in headphones Frequency range of 68 Hz - 20 KHz; 4.6 watts of total RMS power (2.3 watts per speaker) Measures approximately 3 by 5.3 by 3.2 inches; weighs approximately 1.695 pounds