MOQ100PCS. Use a thin-walled, flat, or slightly concave-bottomed mug for best results–This electric mug warmer can slow down the cooling speed of hot beverages; You can choose the temperature by touching the Button to keep or warm up the temperature of the drink from 100F to 170F.With the timer shutdown function, you can choose to automatically shut down after working for 2-12 hours after pressing the timer button,by default, the coffee warmer will automatically shut off after 4 hours. Compatible for stainless steel,ceramic mug and glasses mug. Touch switch + gravity sensing dual protection.