Stainless steel body with a two-layer ceramic coating inside and out. Your drink only touches ceramic. Capacity: 14 oz / 414 ml. Four settings: 122°F, 131°F, 135°F and 145°F. Switchable to °C. Ondo heats your drink to the temperature you set and holds it there. If the drink cools, Ondo heats it back up. Battery: with the lid on, up to 3 hours at 135°F. Without the lid, about 120 minutes at 135°F. Set it back on the coaster anytime to top up. To turn it on, set it on the coaster and lift it off, or hold the button for 2 seconds. In the box: mug, insulated lid, charging coaster, USB-C cable, power adapter, user guide.