Although many use portable speakers via Bluetooth nowadays, most speakers still have USB ports for reasons other than playing music from your phone.

【USB Sound Card】- External stereo sound card connects to 3.5mm audio headphones, earphones, speakers or microphone ... 【Widely Compatible】- Usb to 3.5mm jack compatible with any system ...

Virtually all smartphone manufacturers have eliminated the 3.5mm audio jack ... speaker systems, and other home gadgets could all connect to your headphones and smartphones via USB so why not ...

We’ve even seen some new-boat models offered with portable wireless speakers as the default audio system ... A dedicated AC/DC adapter connects via a jack beneath a watertight twist-off port that also ...

Also included in the box are 2m of connecting speaker wire, a minijack audio cable, plus a USB lead to connect your PC. All of this, plus the speakers, comes packed in microfiber cloth bags for ...