Digital Innovations Accoustix 2.0 USB Portable Speakers: * Ultra-slim design 2.0 channel stereo sound quality speakers * Powered from any USB port (no external power required) * Magnetically shielded for optimal sound quality * Blue LED lights * On/Off switch and volume controls Includes:* Multimedia speakers and Quick Start Guide System Requirements:* Available USB port, available 3.5mm audio jack Technical Specifications:* Power output: 2 watts (1 per channel) * Frequency response: 200Hz~20kHZ /- 3dB * Impedance: 4 ohms