Electronic circuitry, integrated circuits and circuit boards; touch-sensitive input devices for consumer electronic products that allow the user to interface with or control the products and software therefor; computer software design tools for developing touch-sensitive input devices for consumer electronic products that allow the user to interface with or control the products; biometric systems comprising one or more biometric sensors or software for identifying or verifying a user of a device; capacitive sensors to interface with or control a consumer electronic device, and software therefor