I received this as a gift (opened shrink wrap to see the gift), but never used the mug because I don't drink coffee that often or at a desk where this is desirable. I'm moving and just found this in my cupboard so selling it to someone who can use it because it seems like an awesome idea! The smart mug allows you to set an exact drinking temperature, so your coffee is never too hot, or too cold. Ember Mug is safe to hand wash and submersible up to 1 meter in water.