It's non-ionising, thus unable to liberate electrons from their atoms. It can still do stuff like heat water up (though low-power signals have correspondingly l

It's non-ionising, thus unable to liberate electrons from their atoms. It can still do stuff like heat water up (though low-power signals have correspondingly low heating power) or communicate with electronics (e.g. firmware update your smartwatch to short the battery), though, so it's not unconditionally safe. I'm sceptical that low levels of non-ionising radiation can do damage, but it's not physically impossible. (I know of no biological mechanism by which it could cause harm, but I'm no biologist.)