| 摘要 |
Sensor means for monitoring the awareness status of an individual within a monitored environment ( 50 ) comprising means ( 55 ) for determining the attainment of at least one predetermined condition identifying the requirement for the awareness of an individual to be monitored, and operative to trigger an alarm ( 70 ), means ( 15 ) operable by the monitored individual for inhibiting the operation of the alarm, and delay means for delaying the triggering of the alarm ( 70 ) for a predetermined period after the attainment of the said predetermined condition.
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