It can rapid heating within 3s.The heater will turn off when the temperature reaches 167-degree F.will automatically shut off when the heater is overturned.you can carry it with you easily in any room.160oscillation provides evenly distributed warm airflow.Features:Quick and Powerful:Portable electric space heater adopts the newest and safest ceramic PTC heating system. It can rapid heating within 3s.Safety First:1Overheat protection ensures the space heater does not overheat.The heater will turn off when the temperature reaches 167-degree F. ;It also has a smart design that will automatically shut off when the heater is overturned.Portable Design:1Measuring only 7.9 x 5.5 x 5.1-inch,Lightweight but powerful,you can carry it with you easily in any room.Warm Area :160oscillation provides evenly distributed warm airflow. Specification:Input voltage: 100-240VInput current: adaptiveProduct material: ABSUsable area: about 15-50 square meters Package:1 x Heater