Notifier CPX-551 This is an ionization smoke detector. Brand NotifierModel CPX-551Manufacturer System SensorType Smoke Detector
EST SIGA-278 Category : EST/EdwardsThis unit is rusting ever so slightly. It features a newer EST logo on it.
Wheelock ET-1080-WS-24 Category : WheelockYou can’t really tell from the pictures, but the strobe is practically falling out of this particular unit.