This cup warmer has three temperature settings, you just need to touch the button to adjust the temperature. This coffee cup warmer is made of waterproof tempered glass and ABS flame-retardant material.Intimate auto shut-off function, even if the work is too busy, the coffee cup warmer can be automatically turned off. With a flat glass surface design, this cup warmer plate is suitable for flat tableware, stainless steel cup, mug, milk box, glass cup and etc. We recommend using steel flat and thin-bottomed mugs to achieve the best thermal insulation effect.