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Review title: Not even luke-warm
Product review: This device doesn't do anything to prolong the warmth of your beverage. I started with a hot cup of tea, drank 2/3 of it within the first hour, left for lunch, and my last third was barely over room temperature when I returned.I repeated the hot fluid level and timing using a coffee mug with a completely flat base (which you won't find on most mugs). Still, slightly above room temp. Cold to the tongue, moderately warm to the hand.:(
