Ember Temperature Control Mug 2 in black offers a premium drinking experience by allowing you to set and maintain your precise preferred temperature via smartphone. This 10 oz smart mug features a durable stainless steel core with a reinforced coating, providing up to 1.5 hours of battery life on a single charge or all-day use when kept on the included charging coaster. Designed for convenience, it is IPX7 rated and fully submersible for safe hand washing. The sleek, modern design integrates seamlessly into any home or office setting, ensuring your coffee or tea stays perfectly hot from the first sip to the last. Note: The original box shows some minor wear and the factory seal has been partially lifted, but the item remains unused. The plastic has been removed.