Lenovo ThinkVision LT3053p 30in LCD Monitor - Manual (Page 15)

Chapter 1.
1-11
10. Connect the speaker’s audio cable and audio jack of monitor to transfer audio source from
Display Port, or HDMI, or MHL.
Note: At the PIP/PBP mode, only main source (Background Screen at PIP mode, Left
Screen at PBP mode) can transfer the audio to the jack.
11. The 3 USB ports on the side are the downstream ports dedicate to USB 3.0 Upstream port
(on the bottom of monitor), they are compliance with USB 3.0 standard.
The top one is compliance USB Battery Charge Standard Version 1.2, that can charge
portable device, max to 2A current.