This article explains how to use earbuds on an Elo AIO when it doesn't have a 3.5mm audio jack

Some Elo AIO systems are not equipped with a 3.5mm Audio jack. For customers who wish to use audio devices such as earbuds or headphones that have 3.5mm audio connectors, try using a USB to 3.5mm Audio Jack adapter. See below for tested adapters.

For USB-C to 3.5mm

• USB C Male to 3.5mm Female Headphone Jack Adapter,Type C to Aux Audio Cable Cord
• USB C to 3.5mm Dongle Headphone Jack

For USB-A to 3.5mm

• USB to 3.5mm Jack Audio Adapter

For Elo's I-Series and devices equipped with Edge Connect

• The Elo Edge Connect™ Audio Adapter