Two 40mm Nd-Fe-B high-quality speaker, 4 ohms, sound pure Humanized design,easy to adjust volume,easy to operate Crystal clear appearance, built-in light blue decoration, fashion personality, small size. Unique cabinet and the circuit design processing, the maximum damping and high frequency equipment cabinets to avoid interference, more realistic audio, perfect to restore. Professional and efficient digital power amplifier, alt clear and bright, high resolution, detail-rich. With high-grade imported acrylic material and advanced production technology is refined, delicate work smooth, elegant high-grade, built-in light blue decoration is fashion choice for a family. Can be accessed by laptop computers, cell phones IPod, MP3, MP4, CD, PDA, etc., a laptop, handheld digital video products and TV's best fashion partner. USB power supply ~ 5V, 500MA, 50Hz. 4W. Speaker Size: 50 ? 50 ? 50mm