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The technology typically found in motion sensors to trigger an alarm includes infrared, ultrasonic, vibration and contact. Dual technology sensors combine two or more forms of detection in order to reduce false alarms as each method has its advantages and disadvantages. Traditionally motion sensors are an integral part of a home security system.
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In practice, users of security systems may intentionally reduce the effectiveness of an anti-theft system to increase its usability (see also: Password). For example, a home security system will usually be enabled and disabled with an easy-to-remember code such as "1111" or "1234", instead of a more secure combination.
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The system signals locked or unlocked status through discreet signaling — by the lights, horn, or both. A vehicle might use a chirp system: two beeps on driver door unlocking, four beeps on unlocking of all doors, a long beep for the trunk or power tailgate or a short beep on locking and arming of the alarm.