Ricco&reg; P26 Computer Speaker (Pink) Compatible with Any Laptop/Desktop Computer with USB Port, PC and MAC compatible Computer OS: Windows (XP, Vista, 7), Mac OS X (10.4 or higher) Convenient Power Source: 5V USB Self Powered Very Light aluminium body, Weight only 142g. Dimension: 204mm32mmx24mm Powerful Output: 5W (RMS), S/N Ratio=79dB,Impedance:4 ohms, Frequency:80Hz-20kHz. Driver Units: YDT2065 Class D Amplifier Included: ONE Mini Speaker with USB Standard A Cable, Laptop Monitor Clip and Desktop Stand.