RADARCAN R-102 Manual Del Usaurio página 8

The ultrasound waves fan out uni-directionally from the
MOSQUITO 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 MOSQUITO 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 MOSQUITO
REPELLER HOME inside the space to be protected, and avoid
blocking the flow of the ultrasound waves from the front
part of the device.