This is the nect in the contractor series of smoke detectors. Cheap,                                                                                                                                    
ugly, but they work. Battery backup tamper resistant. Has a 9 volt                                                                                                                                      
battery to run the unit in the event of an AC power failure. This                                                                                                                                       
feature is starting to become mandatory in North America, great idea                                                                                                                                    
Battery included, inter-connect up to 18 units, alarm source indicator                                                                                                                                  
Alarm/Power test LEDS, Photoelectric sensing, which is sensitive to                                                                                                                                     
smoke particles, 10 year limited warranty. Rugged units, but not the                                                                                                                                    
best looking on the market, but then the price is good                                                                                                                                                  

                                                                                                                                                                                                   
        1-*       0+                                                                                                                                                                                    
$C     23.41   22.51                                                                                                                                                                                    
$US    22.71   21.83                                                                                                                                                                                    
EURO   15.22   14.63