ionMug & Charging Coaster, 12oz. Stainless Steel Self Heating Coffee Mug with Lid, 3.5" x 3.5" x 5"

Purchased for a gift. Recipient was impressed with how easy it was to use and it maintains desired temperature (internal battery). Temperature control is on the cup eliminating the need to control through an app. If you do get busy and forget your coffee/tea it reheats very quickly. Several of her friends have purchased on her recommendation.

ok, for those who didn't read the instructions... this cup is amazing, I'm on month two with it, no issues bottom of your cup, hold button until lights flash, choose your temp or whether to put it to sleep... don't forget to do that after your finished... this will keep your drink hot, so hot, you'll need lip balm for the burn if you aren't careful about one hour off charger, then recharge, repeat. my process is simple, fill, drink, repeat. I work up to 12 hours at my office, so do purchase if you are tied to a desk