Here is an app controlled heated coffee mug that keeps your drink at the right temperature for 90 minutes on a single charge. The Ember Mug 2 has an adjustable temperature range of 120-145F. Simply pair it to your smartphone, and you will be able to set your desired temperature, customize presets, and activate notifications.
This stainless steel coffee mug is safe to handwash. It is IPX7 rated and fully submersible to 1 meter. It is smart enough to know when it is empty to go to sleep mode.[where to get it]