LED cup activated by liquid - Idea4fun

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LED cup activated by liquid - Idea4fun

LED drinking timer - A glowing pad / coaster reminding to drink water

LED cup activated by liquid - Idea4fun

LED cup activated by liquid - Idea4fun

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LED drinking timer - A glowing pad / coaster reminding to drink water

LED drinking timer - A glowing pad / coaster reminding to drink water

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LED cup activated by liquid - Idea4fun