Rare Smoke Detectors

[Fire_Alarm_Fan]

Here’s a Norelco HB-0933 w/test button, NIB.
http://www.ebay.com/itm/Vintage-Norelco-Smokey-Smoke-Detector-HB-0933-/291499117850?pt=LH_DefaultDomain_0&hash=item43deb38d1a