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What is this device named LRAD for?

receives radio waves.

explores the bottom of the sea / ocean.

sends acoustic waves

emits infrared light

The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeakers. LRAD systems are used by law enforcement, government and defense agencies, as well as maritime and commercial security companies to broadcast audible notifications and warnings over distance.

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18

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