High-quality stereo speakers for notebooks and desktops. They provide clear and natural sound quality. The elegant design makes them fit well at your desk with LCD monitor and other accessories. They work well with all computer units with speaker and USB outputs. They are equipped with built-in volume control and headphone output. High-quality materials used for their manufacture protect against static electricity and electromagnetic interference. TECHNICAL DATA: Effective power: 2x3W Impedance: 4? Frequency range: 60Hz-20kHz Headphone Output: mini-jack stereo 3.5mm Power supply: 5V They require: USB and mini-jack 3.5mm headphone output . Manufacturer: Esperanza