Based on my understanding, wireless signals are lights. Why can I use my gadgets inside a room?
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Electromagnetic waves have a wavelength, and the wavelength determines how it interacts with other objects. It the EM wave has the right wavelength, it triggers with the photo-receptors in our eyes and we see it as light. If they have a different wavelength, they will get absorbed by water molecules, making them move and heat up. This is how mirowave ovens work. Most wavelengths are either absorbed by matter or reflected by it, but if the wavelength is small enough, it will pass through certain kinds matter without interacting with it at all. This are radio waves.
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