Small USB speakers with audio jack,two full-range loudspeakers^ The usb speakers back of the main box is equipped with the output interface of the sub box, USB and signal input lines, and volume control knob^ The bottom of laptop speakers also designed with four soft feet to stabilize the box and reduce resonance^ Behind the main box is designed a very large recessed adjustment dial, not only a scale and a pointer, so that blind operation is also very smooth^ The mini speaker exterior design is very small and cute, but also very portable.