Portable Speakers and easy to carry music everywhere. High Quality. USB 2.0 SPEED, BLUE COLOR, 100% Quality. Stereo sound output for computers, MP3, MP4 and notebook. Built-in amplifier. Power, volume/Tone control. Magnetically shielded. Mellow and clear timbre. Pure and elegant sound quality with unsurpassed effect In compliance with acoustics and astatic rationale, Flexible sound with distinct tone levels Small sized design, easy to take Best for PC, Laptop and Cellphone. SPECIFICATION: speaker dimension & impendence : 6Ω / output power : 3WX2. frequency response : 90Hz-20KHz/ sensitivity : 80db±2db / SNR: ≥80dB / distortion: ≤0.3% / system configuration: USB 2.0 & USB 1.1 with Audio output with sound card support hot plug and play.