Mug used a few times. Excellent working condition. No signs of wear. Ember, The World’s First Temperature Control Mug. They are award-winning and are the most advanced coffee mugs on the market, allowing you to set and maintain your preferred drinking temperature for hot beverages. Key Features -Keep your drink perfectly hot Set your preferred drinking temperature. -Control with smartphone Set your temperature, customize presets, receive notifications and more. -Safe to hand wash -Auto sleep Ember intelligently wakes up when hot liquid is poured in and enters sleep mode when not in use. -Smart LED LED light at the base of the mug will inform you when your beverage is heating up or cooling off, when it is ready to drink and when your battery needs to be charged. Personalize your mug by changing the LED to your favorite color.