We can see the touch switch everywhere in our daily life. Its application in life is very extensive, especially in household appliances. The tactile switch is a micro-triggerable switch. When the switch is pressed lightly, the switch is turned on. When the hand is released, the switch is disconnected. The internal structure of the switch is driven by the force of the metal shrapnel. Broken. The touch switch has been widely used in household appliances such as: audio and video products, digital products, remote controls, communication products, household appliances, and security due to the reasons of small contact resistance, pressing a crisp feel, and high specification. Products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pen keys, etc. Regarding the pin connection of the five-legged tact switch, two pins are used as a group, the four corners are more stable for soldering, and the fifth pin is for grounding. It is suitable for high density surface mount, some can be cleaned after soldering, and the sealed type can be dustproof. It is most suitable for harsh environments and the circuit design is simple. Product life varies from 100,000 to 1 million times. Today, the market demands more and more touch switches, such as small size, long life, and crisp and even feel.