To perform audio surveillance, you need the right tools. The Bionic Ear & Booster Set can help. It amplifies sound up to 40 decibels. The device offers frequency response between 100 and 10,000 Hertz. The microphone has sensitivity of -46 decibels. A 9V battery lasts you up to 40 hours. You will be able to use this to listen from 100 yards away. Great for birdwatching, private investigations, and public events.
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