....... the OP might have difficulty in identifying such a device, not the least because a very high proportion do seem to have electromechanical relays (most of them 'click'). In attempting to do the opposite (ensuring that what I was buying did have an electromechanical relay), I have found that (unless one goes very up-market/expensive), information provided usually does not indicate whether or not they have a proper relay, such that the only course is to buy one, try it and see if it clicks!
I quite agree and I have been caught the other way in purchasing a PIR switch which did NOT contain a relay and would not satisfactorily operate a LED !