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Special battery for Therm-ic S.E.T. heated underwear.The thin, compact Bodypack battery is designed to power Therm-ic S.E.T. heated underwear. It is placed in the designated pocket in the Therm-ic heated shirt and connected with three snaps. It has three adjustable heating levels and a heating level indicator. It is operated by pressing the larger button, and you can tell the heating intensity by vibration (1x lowest, 2x medium, and 3x highest heating power). You can easily adjust the heating level even when you have multiple layers of clothing on.Charging via USB cable, the power adapter is not included in the package.FeaturesCompatibility: the Bodypack battery is specially designed for S.E.T® heated underwearEasy attachment: the battery is easily attached in the designated pocket using snaps, and it is comfortable to wear3 heating levels: heat can be regulated thanks to 3 heating levels, it can be set by pressing the button (vibration indicates the heating intensity)The battery is resistant to moisture evaporating from the bodyCharging via USB cableHeating time