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J.C. Penny and Home Depot are reportedly considering using the device, which monitors signals from personal cellphones through antennas.

At least two malls already using it stopped this weekend after Schumer contacted them.

The senator has urged the manufacturer, Path Intelligence, to ask shoppers to "opt in" before tracking them.

Now the only way to avoid being tracked is by turning off one's cellphone.

"It's sort of creepy to know that every movement you make in any store or in any mall is being followed. Most people probably, in my judgment, wouldn't like that," said Schumer.

Path Intelligence says that its technology keeps shoppers' personal information anonymous.

The senator is also calling on the Federal Trade Commission to explore how the new technology violates consumer privacy regulations.