HYTOBI S21 USB Powered Speakers MES21-BLK Great for Desktop/Laptop computers or MP3 Players. Volume control and On/Off button, headphone jack, plus 3.5mm jack input for your MP3, DVD or CD player Sleek, elegant and portable to add class to your desktop wherever you are without taking over your space. Plug n' Play USB connectivity. Simply plug into your laptop or desktop computer's USB port. Works with Windows and Mac OS Backed by HYTOBI 1 year manufacturer's warranty