Input: 3. 5mm Mini stereo lack Power Output: 2 watts per channel Frequency Response: 200Hz-20KHz Input impedance: >10kohm Signal -to-Noise Ratio: 80dB Battery powered: 3 AA batteries Or charger with outside power Dimensions: Length 50mm *Width 27 mm *Height 120 mm Weight: 250g DESCRITION: Compatibility-The stereo mini jack connection allows You to enjoy high quality audio from a variety of Devices it's the best choice for IPOD. Advanced Technology-The portable speaker system Combines many proprietary technology to provide The highest quality sound and playing ti me. The portable Speaker system will provide astonishing bass and clear Accurate sound from a pocket sized system. Digital amplifier technology-The Class D digital Amplifiers provide clear, and more powerful Sound while extending battery life. Battery powered-three fresh AA batteries provide Over 24 hours of continuous play at normal to high Listening levels. Electronic key-press adjusts the volume USB2. 0 connector provides same synchroniszation, recharging iptions as your IPOD dock.