Why consider it

  • Integrated motors remove the need for an external motor hub and tubing.
  • Adjustable heating and app controls provide additional settings to consider.

What to consider

  • The plain S1 storage bag does not recharge the pumps; plan to use the charging cables.
  • Magnetic hub connectors mean the correct charging cable needs to be packed.

Specifications

At a glance

Power
Rechargeable; magnetic hub charging connections
Milk collection
Two in-bra cups; 5 oz / 150 ml each
Fit options
24 mm flanges; 17, 19 and 21 mm inserts
Pumping options
Double kit with two pumps
Heating
Seven adjustable heating settings
Controls
App control of pumping rhythm and settings
What comes with it
The plain S1 kit includes two pumps, 24 mm flanges, 17, 19 and 21 mm inserts, magnetic charging cables and a storage bag.
Fit & feel
Included inserts offer three smaller openings, while adjustable heating adds a setting to consider alongside suction and cup positioning.

Details, care & buying

Full specifications & kit details

Power
Rechargeable; magnetic hub charging connections
Milk collection
Two in-bra cups; 5 oz / 150 ml each
Fit options
24 mm flanges; 17, 19 and 21 mm inserts
Pumping options
Double kit with two pumps
Heating
Seven adjustable heating settings
Controls
App control of pumping rhythm and settings
Included carrying item
Storage bag; no charging case

Kit & specification notes

This profile covers plain S1. It does not include S1 Pro case-runtime claims or promise that every app feature remains free after a trial. Heating and control features are specifications, not evidence that this pump improves milk output or prevents a health problem.

Manufacturer-listed specifications checked . eufy product details ↗

Heat and suction are separate settings

You can use the physical buttons without the app. Press the heating button before using +/− to adjust warmth; otherwise those buttons adjust suction. If the lights have gone dark, press a button to wake them, then press the control you need.

A flashing orange light calls for reseating the flange and hub so the heating pins meet correctly. Stop if pumping hurts and seek qualified help for persistent discomfort.

Transfer before taking the cup apart

  1. Pause or switch off, then lean forward as you remove the pump.
  2. Hold the hub and pull the container edge beside the spout outward to release it, then lift the hub. Keep the flange and diaphragm in place for the pour.
  3. Pour into a milk-storage container with the flange facing up. Tip the spout down to finish; only then remove the diaphragm if milk remains underneath it.

Close and label the storage container using the fresh or thawed milk guidance. The exact removal order matters; do not dismantle the full cup before transferring milk.

Prepare power for the next session

Use the supplied magnetic charging connection between sessions. The pumps cannot operate while charging and should not be worn while connected. Heating uses additional battery, so check both hubs before leaving your charger behind; the plain S1 storage bag does not recharge them.

Allow time to clean and fully dry the collection pieces before packing.

Sources: eufy S1 use instructions; heating and battery guidance. Controls, transfer and charging checked October 16, 2026 for plain S1, not S1 Pro. Other profile facts retain their existing check scope.

Before you order

Compare the exact kit, compatible spare parts, return terms and warranty for your seller. Use the cost planner to include any extras you need. If using a US plan, start with the insurance checklist.

View manufacturer details

Manufacturer videos

eufy S1 / S1 Pro flange-sizing demonstration

Covers the shared flange-sizing steps for S1 and S1 Pro. Follow your exact kit’s instructions; the plain S1 storage bag is not a charging case.

Watch at the manufacturer ↗ · Manufacturer source ↗ · Checked

Loading a video connects to YouTube or the manufacturer’s video host, whose privacy terms apply. No player connects until you press its load button.

Instructions & support

Manufacturer videos

Sources & further reading

Sources checked . Product packages and guidance can change.

Overview checked October 8, 2026; kit and fit details checked October 8, 2026. By Breast Pump Clarity. These scoped checks do not recheck every specification.