Almost everyone among us is used to having a cup of coffee or tea regularly.
I am used to a cup of tea or two on a regular basis myself.
When the tea/coffee is too hot, it scalds our mouth and when it is too cold, it simply doesn't taste good. There is a certain temperature at which both tea and coffee can be enjoyed the best but to maintain that temperature at that level is an impossible task to do for us.
The analysts say that tea or coffee can be enjoyed for 37 seconds at their best taste.
So how do we maintain that temperature to enjoy whole cup of tea/coffee!
There is an option to boil it again and again after it becomes too cold to drink but nobody would like the waiting game, besides there will be a huge waste of gas used for boiling it.
Source
Clay Alexander, the founder and ceo of amber technologies invented a mug known as amber mug which keeps the temperature of tea/coffee between 120°F to 145°F for about an hour on its own and it comes with a charging saucer also.
All this is managed on an application which runs on your smartphone.
Here is a link of the product in case you want to buy.