A research-based overview, not a hands-on review. Specifications refer to the linked US manufacturer pages; local kits may differ. How we research

The specifications at a glance

Power
Rechargeable; magnetic hub charging connections
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

Manufacturer-listed features; these are not independent performance measurements. Check these specifications at eufy ↗

Reasons to consider it

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

Trade-offs to check

  • 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.

Put it in your routine

Does the listing include the S1 storage bag or an S1 Pro charging case, and which app features are included beyond any trial? Walk through setting up, collecting, cleaning, and packing away before choosing.

We have not tested this pump. Comfort and milk output cannot be predicted from the specification sheet, and we do not score them. For individual fit concerns, consult a qualified lactation professional.

See the manufacturer’s demonstration

These are manufacturer videos, not independent reviews. Follow the instructions for your exact model and package.

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

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Before you purchase

Verify the exact local package, compatible replacement parts, return policy, and warranty. Prices and benefits coverage vary, so follow the manufacturer link for current details rather than relying on an old price.

View manufacturer details

Sources & further reading

Sources checked . Product packages and guidance can change.