Mackie Studio Monitor, Black w/Green Trim, 3-inch (CR3) Studio-quality design, sound and performance ideal for multimedia creation and entertainment Professional-grade components for optimized sonic performance.1/8 inches to stereo RCA cable to connect computer output to speakers Ultra-wide frequency range perfect for full-range multimedia (80 Hz - 20 kHz) Choose which side of your desk gets the volume knob with CR3's convenient speaker placement switch Convenient front panel volume knob with lit power ring gives you on/off/volume control and power indication where you need it. Plug your smartphone or other source right into the front of the speakers and listen instantly