Dual power and KEEP WARM 300W/600W/Keep Warm. Whether you need to melt wax quickly or gently warm bee wax, it's easy to adjust the heat by turning the control knob. Easy monitor and conveniently Clear temptress glass with thermometer probe hole. Dia: 8mm. Large than traditional holes, allow the thermometer into the melted wax. More safer To avoid overheating, the melter will shut off when the heating element reaches the setting temperature. Don't worry! After the heating element cools down, the melter will auto-work again. Notice: The melter won't auto-shut off.