Color Gray Size 14 Oz Comes in original box. The Ember Mug 2 in Gray warms coffee, tea, or other hot drinks to a specified temperature between 120-145°F and holds them at that temperature for up to 1.5 hours, or all day when used with the included charging coaster. Use the Ember app (iOS and Android compatible) to set your preferred drinking temperature. The Ember Mug 2 features four precision sensors to monitor liquid level and temperature and a microprocessor-controlled heating system. The rechargeable lithium ion battery has a 3-hour battery life and charges when the mug is placed on the charging coaster. Use the Ember app to set the name of your Ember Mug 2 and customize the color of your Ember Mug 2 LED light, indicating that your drink has reached the specified temperature. The Ember Mug 2 features a stainless steel core and a soft touch exterior. Two rings on the bottom of the mug connect with the charging coaster to charge the battery and maintain the drinking temperature while in contact with the coaster. Hand wash mug. Wipe clean charging coaster. What's in the box: Ember Mug 2 and charging coaster Holds drinks at a specified temperature between 120-145°F 14-ounce mug maintains temperature for 80 minutes Rechargeable lithium ion battery has 3-hour battery life Stainless steel core and soft touch exterior Ember app is iOS and Android compatible Hand wash mug, wipe clean charging coaster