Easy to use. Heated in seconds.
ONE BUTTON
Plug any USB power bank into the lead in the inside pocket and press the button on the chest once. The four zones are warm in about 30 seconds. Press again for medium or low, hold to switch off. No app, no pairing, nothing to learn.
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One button on the chest
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Warm in about 30 seconds
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High, medium and low
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Runs on the power bank you already own