You might think the Spectra S1 and Spectra S2 are twins with different paint jobs. While they share the same motor and suction technology, one major difference separates them.
We have tested both pumps extensively. We compared their portability, price tags, noise levels, and features to see which one actually makes life easier for breastfeeding moms.
Here is our definitive breakdown of the Spectra S1 vs. S2 debate to help you choose the right pump for your lifestyle.
| Product | Spectra S1 | Spectra S2 |
|---|---|---|
| Price | Check Price | Check Price |
| Weight | 2.9 lbs | 3.3 lbs |
| System | Closed | Closed |
| Double or single? | Both | Both |
| Timer | Auto timer with digital display | Yes |
| Modes | 72 | 2: Letdown/massage & expression |
| Vacuum levels | 12 | 12 |
| Cycle speed (Letdown) | 70 cycles/min | 70 cycles/min |
| Cycle speed (Expression) | 54, 50, 46, 42, 38 cycles/min | 54, 50, 46, 42, 38 cycles/min |
| Settings selection | +/- push buttons | +/- push buttons |
| Display | Digital | Digital |
| Bottles | 2 with lids, cap discs & nipples | 2 with lids, cap discs & nipples |
| Milk storage bags | Available separately | Available separately |
| Cooler | Included | Included |
| AC adapter | Included | Included |
| Batteries | 1 Lithium-ion battery | Batteries are not required |
| Car adapter | Available separately | Available separately |
| Warranty | 2 years | 2 years |
Product Overviews
Here is a look at the key similarities and differences between these two hospital-strength pumps.
Spectra: S1 Electric Breast Pump
The Best For Portability
The Spectra S1 is widely known as the “Blue One.” Its standout feature is a built-in rechargeable battery that lasts up to three hours. This freedom allows you to pump in the car, at work, or anywhere in your house without hunting for a wall outlet.
It uses a closed system, which means a physical barrier prevents milk from entering the motor. This keeps the pump hygienic and safe from mold growth. The motor is impressive; it offers hospital-grade suction up to 270 mmHg, yet it remains quiet enough to use while your baby sleeps nearby.
The S1 features a two-level night-light and a timer on the digital display. We love that it remembers your settings, so you don’t have to fiddle with buttons every time you sit down to pump.
You can buy the Spectra S1 as a standalone unit or with a tote bag. If you need mobility and power, this is the superior choice.
Pros
- Rechargeable battery: Offers up to three hours of pumping on a single charge.
- Closed system: Keeps moisture and milk out of the motor.
- Quiet operation: Operates at roughly 45 decibels, similar to a library whisper.
- Adjustable cycle and vacuum: Allows for a customized pumping experience.
Cons
- Heavier unit: Weighs about 3 pounds, which can feel bulky.
- Higher price point: Usually costs more than the S2 due to the battery.
- Insurance upcharge: Many insurance plans require a fee to upgrade to this model.
Product Specs
| Weight | 2.9 lbs |
| System | Closed |
| Double or single? | Both |
| Timer | Auto timer with digital display |
| Modes | 72 |
| Vacuum levels | 12 |
| Cycle speed (Letdown) | 70 cycles/min |
| Cycle speed (Expression) | 54, 50, 46, 42, or 38 cycles/min |
| Settings selection | +/ – push buttons |
| Display | Digital |
| Bottles | 2 included with lids, cap discs, and nipples |
| Milk storage bags | Available separately |
| Cooler | Included |
| AC adapter | Included |
| Batteries | 1 Lithium-ion battery included |
| Car adapter | Not included — available separately |
| Warranty | 2-year warranty from date of purchase |
Spectra: S2 Plus Electric Breast Pump
The Best for At Home Pumpers
The Spectra S2, or the “Pink One,” offers the exact same motor and suction capabilities as the S1. It features the same massage and expression modes designed to mimic a baby’s natural nursing rhythm. The key difference is that the S2 must be plugged into an electrical outlet to work.
It includes a clear digital display and a built-in night-light, making those 3 a.m. sessions manageable. The interface allows you to adjust the cycle speed and vacuum strength independently. This helps you maximize milk output without causing nipple trauma.
Since it lacks the internal battery, the S2 is slightly lighter than the S1. It is an excellent option if you have a dedicated pumping station at home or at work and want to save money.
You can buy the Spectra S2 knowing spare parts are easy to find. It’s often fully covered by insurance plans without an upgrade fee.
Pros
- Cost-effective: More affordable than the S1 and often fully covered by insurance.
- Powerful suction: Provides the same hospital-strength output as the S1.
- Lightweight: Weighs slightly less since it lacks a battery.
- Hygiene: Uses a safe closed system with backflow protectors.
Cons
- Not portable: Must be plugged into a wall outlet to function.
- Color options: Only available in pink, which some parents dislike.
- Reset required: Does not revert to “massage mode” automatically after power cycling.
Product Specs
| Weight | 3.5 lbs |
| System | Closed |
| Double or single? | Both |
| Timer | Yes |
| Modes | 2: Letdown/massage and expression |
| Vacuum levels | 12 |
| Cycle speed (Letdown) | 70 cycles/min |
| Cycle speed (Expression) | 54, 50, 46, 42, or 38 cycles/min |
| Settings selection | +/- push buttons |
| Display | Digital |
| Bottles | 2 included with lids, cap discs, and nipples |
| Milk storage bags | Available separately |
| Cooler | Included |
| AC adapter | Included |
| Batteries | Batteries are not required |
| Car adapter | Not included — available separately |
| Warranty | 2-year warranty from date of purchase |
In-Depth Feature Comparison
When we pit the Blue One against the Pink One, how do they stack up in specific categories?
Settings and Performance
Internally, these pumps are identical twins. Both offer a “Massage Mode” (70 cycles per minute) to stimulate letdown and an “Expression Mode” for drawing out milk.
The magic of Spectra lies in the vibration. Unlike other pumps that use a harsh tugging sensation, Spectra pumps use a fluttery vibration that many moms find more comfortable and effective for milk production.
You can customize your session with:
- 12 Vacuum Levels: This controls how strong the suction feels.
- 5 Cycle Speeds: This controls how fast the pump sucks per minute in expression mode.
Having separate controls for speed and strength allows you to find a rhythm that feels like your baby. Since both units have the same motor specs (up to 270 mmHg) and noise level (45 dB), performance is a tie.
Winner
Draw
Portability
This is the main event. The Spectra S1 contains a built-in lithium-ion battery. It takes about four hours to charge and gives you roughly three hours of pump time.
This battery changes everything. You can pump in the car rider line, at your desk, or while sitting on the floor playing with your toddler. However, “portable” is a relative term here.
- The Bulk Factor: Both pumps are roughly the size of a cantaloupe. They are not pocket-sized like newer wearable pumps.
- Carrying It: Even with the battery, you have to carry the S1 by its handle. To be truly hands-free, you will need a good pumping bra or an aftermarket bag.
The Spectra S2 ties you to a wall. You must be within six feet of an outlet. You can buy an external battery pack to hack the S2, but it adds more wires and clutter to your setup.
Winner
The S1
Accessories and Parts
Both pumps come with the same kit in the box. You generally receive two bottle sizes, two flange sizes (usually 24mm and 28mm), tubing, backflow protectors, and duckbill valves.
Replacement parts are interchangeable between the S1 and S2. This makes it easy to find spares at Target, Amazon, or specialized medical supply stores.
We recommend a few add-ons to improve your experience with either model:
- Cara Cups: These wearable collection cups sit inside your bra. They connect to your Spectra via tubing, allowing you to pump discreetly without bottles hanging off your chest.
- Car Adapter: Essential for the S2 if you plan to travel, but also a good backup for the S1.
- Storage Bags: You can buy adapters to pump directly into bags, saving you from washing bottles later.
Winner
Draw
Insurance Coverage
The Spectra S2 is a staple for insurance companies. Most plans in the US will cover the cost of the S2 at 100%.
The Spectra S1 usually falls into the “upgrade” category. Because it has a luxury feature (the battery), insurance companies often ask you to pay the difference. This “upgrade fee” typically ranges from $30 to $80, depending on your supplier.
If budget is your primary concern, the S2 wins. However, many moms find the small upgrade fee for the S1 is worth every penny for the freedom it provides.
Winner
The S2
FAQs
What is the difference between Spectra S1 and S2?
The main difference is the power source. The blue Spectra S1 has a built-in rechargeable battery for portable use, while the pink Spectra S2 must be plugged into a wall outlet to function. Internally, the motors and suction strength are identical.
Are the Spectra S1 and S2 hospital grade?
Yes, both the S1 and S2 are considered “hospital strength” pumps. They offer high suction power (up to 270 mmHg) and use a closed system to prevent milk from entering the motor, which is a key requirement for hygiene.
Can I use the Spectra S2 in the car?
Yes, but you will need to purchase a 12-volt car adapter separately. Since the S2 does not have an internal battery, the adapter must be plugged into your vehicle’s power outlet during the entire pumping session.
Can I turn the Spectra S2 into a portable pump?
Technically, yes. You can purchase a portable external battery pack (often used for CCTV cameras or laptops) that is compatible with 12V devices. However, this is an aftermarket hack and may void your warranty if the voltage is incorrect.
Spectra S1 vs. Spectra S2 Conclusion
Which pump deserves a spot on your baby registry?
Choose the Spectra S1 If…
You value freedom. The Spectra S1 allows you to pump anywhere. If you plan to return to work, pump in the car, or simply don’t want to be stuck next to an outlet in your living room, the S1 is the superior choice. The rechargeable battery is a game-changer for active moms.
Choose the Spectra S2 If…
You want to save money or have a fixed routine. The Spectra S2 is reliable, powerful, and often free through insurance. If you exclusively pump at a dedicated station at home or work, you won’t miss the battery. It delivers the exact same milk output as the S1 for a lower price.
Ultimately, you cannot go wrong with either. Both provide the comfort, hygiene, and efficiency Spectra is famous for.
