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When a user interacts with a capacitive membrane switch by touching its surface, their finger acts as one plate of a capacitor, and the conductive traces on the switch's layers act as the other plate. As a result, a small capacitance is formed between the user's finger and the conductive traces. The switch's electronics detect this change in capacitance, allowing the device to register the touch and respond accordingly.

Capacitive membrane switch is a special kind of membrane switch. There is no dome in the product, and the tactile feedback is also poor.