What is the difference between the S1 and S2 pump?

The S2 is pink and must be plugged into a wall during use, whereas the S1 model is blue and includes a rechargeable battery.

Is the gray tote bag also insulated?

No, the Tote bag is not insulated.

does it work in 220V countries ?

The S1/S2/9Plus Pumps are 100-240V dual voltage and are international compatible. You will just need the plug converter of the country you are traveling to.

S1 Plus Electric Breast Milk Pump with Tote Bag, Breast Milk Bottles and Cooler for Baby Feeding

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