WaPo recently did a story on the new mosquito device at Chinatown.

Can you hear it? Try it out.

12 KHz – Should be audible 55 years old and under

13 KHz – Should be audible 50 years old and under

14 KHz – Should be audible 45 years old and under

15 KHz – Should be audible 40 years old and under

16 KHz – Should be audible 35 years old and under

17 KHz – Should be audible 30 years old and under

18 KHz – Should be audible 25 years old and under