Sanwa Supply Compact PC Speaker (USB Powered) MM-SPL23UBK

It's USB-powered and doesn't require an AC power source, making wiring neat and easy to install. The 3.5mm connector allows it to be connected to a variety of devices, including monitors. Its ultra-compact size allows it to be installed in a space-saving manner, such as under a monitor or on a desk rack. Despite its small size, it produces a powerful sound with a maximum output of 6W. The back of the product is equipped with a passive radiator that enhances bass. The control buttons are located on the front, so you can operate the speaker without having to reach behind it. The power and volume buttons are separate, so you don't have to worry about having to readjust the volume.