The ultrasound waves fan out uni-directionally from the
FLY REPELLER HOME, like fluorescent light. Hard substances
(walls, ceilings, furniture, glass, etc.) promote better spreading
out of the sound waves, as they bounce off these surfaces,
whereas soft materials (cardboard, curtains, carpeting, etc.)
absorb the sound waves.
Remember, when installing the FLY REPELLER HOME, that
ultrasound waves do not penetrate walls (brick, plaster, etc.),
or wooden room dividers, glass, plasterboard false ceilings or
other solid materials. Hang the FLY REPELLER HOME inside
the space to be protected, and avoid blocking the flow of
the ultrasound waves from the front part of the device.