Application scope: household appliances, medical equipment, industrial equipment, computer peripheral equipment, military industry. The key protruding type includes bumping the key points on the line to enhance the hand feeling. 

The other parts include isolation layer, lower circuit and optional panel printing. The principle is the same as that of ordinary type. When the panel key point and the convex part of the upper line contact with the lower line, the electronic contact (signal) will be generated. Although the pet key is limited by the operation and storage environment, the convex key can be adjusted to different strength.