Internal Multimedia Speaker Internal Multimedia speaker-1 Internal Multimedia Speaker for Desktop, Easy Installation as a CD-ROM PMPO: 15W Control type: button Drive unit: 2.25-inch (full range) Power: accept power supply with 12V Rated impedance: 4 ohms Frequence response: 100Hz to 20kHz (+ - 3dB) Separation: 92dB Weight: 0.72Kg