Onlyheareachstairboardfromthe1stfloortothe2ndfloor.
Thefirstsirensounded.
ThisisAiTigerTour
Deliberatelyapplythepaintwith"smartnano-vibration"oairboard.
Whenthebossisout,opentheprogramand.
Aslongassomeonewalksupthestairs.
The"hiddenreceiver"attheheadofthebedwillsoundanarm.
Hearthesound.
lessthan30seds.
AiTigerTour.
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