An alarm system for detecting, signaling and reporting the occurrence of a penetration towards or an unauthorized entry into a defined area, such as towards or into a closed automobile. The alarm system includes a proximity detector to detect an intrusion into a prescribed zone or region around the defined...http://www.google.fr/patents/US4897630?utm_source=gb-gplus-shareBrevet US4897630 - Programmable alarm system having proximity detection with vocal alarm and reporting features
Programmable alarm system having proximity detection with vocal alarm and ...
