I hope this pic works. It has been a while since I posted pics here but I found this online. It is a picture from October 1979. Look at the smokes on that display. Those are neat and very popular ones from back in the day but I have never seen a plug in smoke like the one by the man’s left hand. It is a big square plug in detector. Looks extremely rare and there is also a rectangle detector that looks more like an alarm clock radio. (could be a combo of a radio and smoke detector). It is towards the very bottom of the display. Fire Alarm Fan you might know what they are. Pretty cool display if you ask me.