The first thing was to know that you can not put the Ion Mug on the charger with no liquids in it, but it takes time to charge for your first use so I put cold water inside while waiting for the charge. I love the light on the bottom of the mug that turned green to tell me it was ready for use. I decided to try coffee since I can be know to put my cup down and find it hours later to just put in the microwave to warm up again. It didn't take very long at all before my coffee was nice and hot and tastes like I just poured it. I would definitely recommend this product.