The control pod makes it easy to control volume and headphone controls
You can fill your room with big, balanced sound (25 watts)
The compact sub-woofer fits into tight spaces and delivers deeper bass when you want to feel the beat
With its easy setup, just connect the speakers to the sub-woofer, and plug the sub-woofer into your computer. That's it
System requirement is any device with a headphone jack (3.5 millimeter) input. Sub-woofer - 15 W
Simple Setup - Connect any device via the 3.5mm input. Simple setup; always great sound.
Easy Controls - Easily access power, volume and the headphone jack using the wired control pod.
Rich Sound - 50 Watts Peak/25 Watts RMS power delivers full-range sound tuned for balanced acoustics. Enhanced bass is delivered by the compact subwoofer.
Enjoy a rich audio experience straight out-of-the-box.

From the manufacturer

Logitech Z313 2.1 Speaker System

Rich Sound for a Full Range Audio Experience

This 2.1 speaker system delivers balanced acoustics and enhanced bass from a compact subwoofer. Connect any device via the 3.5mm input and easily access power and volume on the wired control pod.