Electrical monitoring devices may include alarm devices that are designed to assist parents or attendants in identifying a wet diaper condition shortly after the diaper has been soiled. The devices may produce a visual, an audible, or an electronic signal. These electrical monitoring devices have been...http://www.google.com.au/patents/US7449614?utm_source=gb-gplus-sharePatent US7449614 - Absorbent articles including a monitoring system powered by ambient energy
