hat
Aparèy ultrasound yo souvan fè konnen nan magazen brikoleur. Men, lè Stiftung Warentest te pran yon gade pi pre nan aparèy yo, bloodsuckers yo sèlman ezite dis segonn pi lontan anvan yo kite: apre yon mwayèn de 35 segonn olye pou yo 25 segonn san ultrason. Anplis de sa, moun ki gen odyans amann tande ton anwo a epi tou yo pi plis énoyé pase ensèk yo.
eng
Ultrasound devices are often touted in DIY stores. But when Stiftung Warentest took a closer look at the devices, the bloodsuckers only hesitated ten seconds longer before they left: after an average of 35 seconds instead of 25 seconds without ultrasound. In addition, people with fine hearing hear the high pitch and also are more annoyed than the insects.