- on Home & Garden
- Published in issue 7/2008 on page 20
Environmentally-friendly Mosquito Repeller
According to certain publications, the frequency emitted by the male mosquitoes is said to be around 20–25 kHz, and so within the realm of ultrasound. But according to others, it is in the region of 5–7 kHz instead; frequencies that a human ear, even an elderly one, can still hear very well.