The attached Speakers are USB Port speakrers 2.0 which of modules is opened by ourselves. the price and quality are very excellent, please don't hesitate to contact me if you're interested in, we'll be your good choice. Genereal Introduction: 1. Output power: 0.6*2W 2. Matching speaker: 4R3W/8R2W 3. Frequency response: 70-20KHz 4. SNR (Signal-to-Noise): 8adb 5. Power supply: Connect with PC directly by USB PORT. 6. Expanded function: Key-press/VOL+, VOL-, Mute, In-phase with PC, VR volume control, LED lens coruscated, Loud control.