Ember Mug? Metallic Collection is a brilliant new take on Ember?s classic smart mug, and is guaranteed to make every morning shine. Ember allows you to set your preferred drinking temperature, so you can enjoy your hot drink?just the way you like it? from the first sip to the last drop. Ember Mug? maintains your chosen drinking temperature for up to 1.5 hours with the built-in battery, or all day with the included charging coaster. Ember Mug? is safe to hand wash and submersible up to 1 meter in water. Ember Cup?s built-in battery maintains your precise drinking temperature for up to 1.5 hours or all day with the included charging coaster. Smart LED. Built in battery. Autosleep. Temperature range 120?F - 145?F