The popping chamber is made of food grade aluminum alloy and the surface is made of BPA free and durable thermal conduct ABS with scratch and bump resistance. Its one-key operation makes it very easy to operate as you just need to add kernels into the popping chamber in order to get crispy delicious popcorn in no time. Also, the popcorn once prepared falls into the bowl directly.When the Popcorn is working, the temperature of interior surface will be very high, pls avoid touching the heated surface. If you continue to popcorn 2 times, wait for 10 to 12 minutes before using the Popcorn Maker again. This is a home hot air popcorn machine, it can not directly add butter and sugar, after the flavor Popcorn has been, you can add condensed milk?butter or caramel.Explosion took at least 15 minutes.