?Use suitable mugs?: It can be fit most cups, such glass cup,stainless steel cup, Ceramic cup etc. The double-layer vacuum cup, or the bottom of the cup is too thick, The heating effect will not obvious.For better results, we recommend using flat bottom glass cup or stainless steel cup. Placing a lid over the mug will also help retain heat.
?Safe & Reliable?: Press the time button to enter the timed shutdown mode. The digital display time for the timed shutdown is adjustable from 1 to 9 hours. This coffee cup warmer have a flat glass surface design without security concern for splashing or spilling water on the heating plate by accident and makes cleaning a breeze.