Foods cook at a constant temperature and about as fast as on a conventional stove. Of course, you can also sterilize water in the cooker. When set up, the cooker is conical in shape. The conical reflection shield reflects the sun into the centre of the cone, where a black cylindrical food container collects the heat. After about 45 minutes, the temperature of the food is around 90 degrees Celsius. The size of the cooker is very small: 250mm in height and 130mm in diameter. The BCK Solar Cooker can be easily transported in the backpack. It would be particularly useful during activities such as mountain expeditions or bike tours.