• Differences in Heating Function: The S1 offers 7 levels of customizable heating, while the E20 provides 3 levels of quick heating.

• Charging Methods: The S1 uses magnetic charging, whereas the E20 utilizes USB-C charging.

• Accessories: The S1 comes with a variety of accessories. It contains two pumps with 24mm flanges, inserts of 17/19/21mm, two charging cables, a chic storage bag for portability, two dust covers, and a cleaning brush. While the E20 only includes some basic ones. It contains two pumps with 24mm flanges, two charging cables, two extra duckbill valves. Sizing inserts and other accessories are available on eufy.com or Amazon.

If you have any other questions about the eufy Breast Pump E20, please don't hesitate to contact us for further assistance.