Specifications: Output:RMS3w+3w S/N Ratio:60dB Isolated Rate:60dB Impedance:4ohms Power:USB5V Speakerunit:3W*2 Feature : 1.Accompanying speaker for PC,Mp3,MP4 and notebook 2.Mellow and clear timbre 3.Built-in active amplifier 4.Pure and elegant sound quality with unsurpassed effect 5.In compliance with acoustics and aesthetics rationable Other information: 1. Stable raw material with high quality 2. Fast shipment 3.We do supply best services to all the customers. The more you order , the better price you will get . 4. If you have problem with the price or other problems , please contact with our sales directly at any time Packing by color box carton size:705*395*370mm q'ty:40pcs/ctn