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Introducing the next generation of Welly technology, our self-cleaning worry free Traveler 20oz with a UV Cap. This triple-walled, copper vacuum insulated bottle comes with built-in UV-C technology that activates at the touch of a button to clean your bottle and water by eliminating up to 99.64% of E.coli and 99.71% Salmonella bacteria.. USB charging cable included with every bottle purchased.