The Ion Mug is the best mug invented to me,I’ve never seen a mug as exclusive as this one.It literally kept my coffee hot as needed no joke.I’m a heavy coffe drinker and this Mug is definitely a game changer for me.It has a charging coaster which is an added bonus,It’s very easy to operate and clean.It was all over a good product.I have no complaints.Please get you an ion mug you’ll never need or want another mug!!