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                       Q2. Setting and realizing of anti-theft function.  | 
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                       Two codes for  anti-theft functions 4093 and 4094, audio guide unit will alarm to remind  visitors return back it when | 
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                       triggered by the two codes. | 
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                       Alarm  time can be set from 0-30 minutes by code 4093 or 4094. (This parameter should  be set on WD-900) | 
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                       Setting  of immediate alarm | 
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                       ⑴. Set alarm time as 0 minute; | 
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                       ⑵. Audio guide will alarm immediately  once it entered trigger zone of 4093 or 4094. | 
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                       Setting  of delayed alarm | 
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                       This setting is always used for  only alarm when exiting, no alarm when entering. | 
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                       Following conditions should be met  to set delayed alarm, audio guide  will alarm after the setting time.  | 
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                       ⑴. Alarm time was set in the range  of 1-30 minutes; | 
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                       ⑵. AG-600 should leave this trigger  zone after it triggered by codes 4093 or 4094; | 
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                       ⑶. Also, only the AG-600 has been  used will realize delayed alarm, one of the two conditions must be met: | 
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                       ① Audio guide has already been  trigger played automatically. | 
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                       ② Audio guide has played 3 complete  audios by keypad manually.(Ignore this, if your model is AG-600N) | 
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