Cool footage, from China, of a product developer showcasing a vacuum flask which can be turned into a power bank for a smartphone when hot liquid is poured inside.
The video, captured in Beijing on October 25, shows the woman inserting a charger cable into the bottle and connecting to her smartphone.
Then, she pours hot water into the cup and the phone starts charging.
The 28-year-old inventor developed it for travellers to charge their phones on their journey.
