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Natural History Museum Remote-Controlled Mosquito. Remote-controlled mosquito can emit 5 different high frequency sounds - simply set the mosquito handset and the mosquito will emit sounds of: 11 KHz = heard by people under 60 years old, 12 KHz = heard by people under 50 years old, 14 KHz - heard by people under 40 years old, 16.5 KHz = heard by people under 24 years old and 17.6 KHz - heard by people under 18 years old
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