How do sodium-acetate heat pads work?

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HEATING PADS

Large Massaging Heating Pad

Massaging Heating Pad!!Two Levels Of Soothing Vibrations!Enjoy a spa treatment, in your own home!! Gentle vibrations and soothing heat ease tired and ...

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$16.99

LARGE MASSAGING HEATING PAD

Massaging Heating Pad!!Two Levels Of Soothing Vibrations!Enjoy a spa treatment, in your own home!! Gentle vibrations and soothing heat ease tired and ...

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$16.99

HoMedics TheraP Moist/Dry Heating Pad HP-200 - 1 Pad(s)

Quick Heat Up TimeFeatures --Heats up quickly - feel the heat in less than 30 seconds. --Even distribution helps deliver heat throughout pad surface. ...

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$16.98