1. test the sound notification of device found by measuring the thickness of obstacles from the table found that the distance between receiver and transmitter devices, 2, 4, 6, 8 and 10, where the thickness of the walls 5 cm with the notification and from the distance between receiver and transmitter devices, 2, 4, 6, 8 and 10, where the thickness of 10 cm to walls with an alert as well.
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