Touch Display - Increase or decrease your temperature on the go by tapping the + or - symbol. Built-In Battery - 3 hours or all day when placed on charging coaster. Auto Sleep - Intelligently senses when to turn on and off. Temperature Range - 120F - 145F (50C - 62.5C). Select your temperature on the mug or with the Ember app. Dimensions: 7.9"H x 3.14"W x 3.14"L. Recommend hand wash. Ember 1-year limited warranty. Includes: Charging coaster. Power adapter.