This number shows the weight of the food you heat. You don't need this feeling at ordinary times. You can heat food directly in the microwave oven. If you want to turn the food over, you can press the pause button at the bottom when heating, open the door and turn it over, then close the door and press it to continue heating. This is more convenient than those. For the light wave problem, the simple light wave key only has the light wave function, and the light wave combination key should pay attention to the microwave function. You can't put ordinary metal materials in it, or it will ignite. The barbecue grill can be placed because it is special and comes with a microwave oven. If you want to put metal, you must buy a microwave oven and mark it as special, otherwise the metal can't be used under the combination key. Note that no metal can be used under the action of ordinary microwave. You can use ordinary ceramic bowls and plates at home when heating meals at ordinary times.