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put car battery into PAS, turn it on and talk. turn off PAS when you talking - you still can hear your voice

put car battery into PAS, turn it on ask another player to turn off PAS that player who turn off PAS - will hear echo of his voice

put car battery into PAS, turn it on and talk. ask another player to turn off PAS when you talking - you stthat player who turn off PAS - will can hear yourhear echo of his voice