Stainless Steel Thermos 500ml with temperature display (Vickos)
Code: 239-F-00094
It has a c2032 battery and changes this way... OK!!! yeah
https://www.youtube.com/shorts/GC6L_8e_ea8

I bought it for my son's milk, but unfortunately the temperature drops very quickly (((resulting in cold water for the baby... I bought another one from a well-known store for 8 € and the water remains warm after many hours!!!! Also, the smell of plastic lasted a long time

It was purchased to be used for maintaining hot water throughout the day inside and outside the house, in order to easily prepare milk for the baby. The indicator stopped working after a few days. The touch sensor on the lid for temperature worked perfectly at first, but with use, it didn't turn on immediately and required several presses until it broke. For cold liquids, it is slightly better than a water bottle, as it does not keep the water frozen but cool. For the baby's hot water, it is relatively good, but its duration of keeping the water warm is affected by the ambient temperature. Its capacity is not 500ml, it is less. I would only recommend it due to its small size for transportation and for covering short-term needs. Its positives are its attractive appearance, its waterproofness, and that it doesn't look "cheap". In the first uses, it left a metallic taste in the beverages.

Firstly, the capacity is not 500ml, but slightly less than 400ml. Secondly, be careful not to wet the lid with the temperature indicator because I accidentally did and it immediately stopped working.
However, as an idea, it is perfect, especially for milk preparation!