Bird xQuad blaster and ultrason x – Pdf
Ultrasonic sounds, (sounds above 15000 Hz), are nearly silent / less audible to humans and most animals. Ultrasound cannot travel through walls or closed doors. The signals bounce off these hard surfaces causing a ricochet effect. Ultrasonic sounds are absorbed by soft materials such as curtains, furniture and carpet, which in turn diminishes the effectiveness of the unit. Shadow areas may occur around corners or behind home furnishings.
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