Easy Set-up and Control just connect the SP-115 speaker to your device and you’re ready to go. Furthermore, the volume knob on the side is easy to adjust at any time. SP-U115 is compatible with most devices, such as laptop and desktop computers, MP3 or CD players and even smartphones or tablets. No drivers are required, Stylish color and cover options and two types of cover options with distinct colors are available. Rich and Clear Sound as the 50mm driver unit and full 3-watt output deliver you clear, strong stereo sound performance. Power supplied by USB port from the desktop/notebook. Volume control.