Ember items have sensors all over the mug that monitor the temperature in the liquid inside, after which activate designed-in heaters When the temperature drops. Ships from Amazon Amazon Ships from Amazon Offered by fzmingyu fzmingyu Offered by fzmingyu Returns 30-day refund/substitute 30-working day refund/substitution This product is often returned https://genghisf420bbd0.muzwiki.com/user