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TouchSensor Switch
The technology is setup as a “TouchCell™”. Each TouchCell™ consists of:
A TouchSensor keypad has a wide operating range, adjustable sensitivity, and is moisture and contaminant resistant. TouchSensor TouchCells are easily integrated into current and new interface designs with no need for electronic circuit modification. Because no software is required, they are a direct, easy and aesthetic replacement for membrane and mechanical switches. Learn more about industry-specific solutions:
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TouchSensor patented the world’s only Field-Effect switch - a software free, solid-state switch. 
TouchCells™ are manufactured by TouchSensor on a rigid or flexible PCB. When 5 volts is applied to the TS100, an electric field is created. The field emanates through any dielectric substrate such as glass, plastic or leather. When a conductive mass enters the field, the sensor detects the change and outputs a 5 volt signal that indicates an event has occurred. The conductive mass can take the form of a human finger, a small metallic component or a volume of liquid. We have used over 75 million TouchCells™ on our custom user-interface panels since 1999.