Ember Temperature Control Mug2 - Black Brand New in sealed box 10 oz Keep your beverage hot for an extended period with this Ember mug • Features built-in rechargeable battery with 1.5-hour battery life • Smart LED light indicates when your hot beverages have reached the desired temperature • Safe to hand wash and fully submersible up to 1 meter deep • Ember App – Set Your Temperature and Customize Presets. iOS and Android compatible.