According to our information, the Samsung Essential S31C does not have built-in speakers.

Samsung Electronics GmbH
Hello,
thank you for your enquiry.
The Samsung Essential Monitor (24") LS24C314EAUXEN does not have a sound output function. It has neither integrated speakers nor a jack connection via which speakers or headphones can be connected.
If you have any further questions, please feel free to contact our technical support team. You can find them on the Samsung website under the tab "Support" > "Contact service" and "Hotline".
Kind regards,
Your Samsung Service Team