First Alert HD6135FB Hardwire Heat Alarm With Battery Backup Summer10 If it's outdoors and dirty

If it's outdoors and dirty from all your humidity or wet weather

Tires/Trim

Low Carbon wire can be easy to work with but it is prone to elongation

Steel construction provides lasting durability

First Alert HD6135FB Hardwire Heat Alarm With Battery Backup Summer10 If it's outdoors and dirtyHighlights: 120 volt AC DC with 9 volt battery backup 135 degrees Fahrenheit fixed rate and rate of rise temperature sensing Microprocessor controlled for fewer nuisance alarms The test silence button both silences a non threatening alarm or low battery warning and allows you to test the unit's functionality Latching alarm indicator which automatically identifies which unit initiated the alarm 120 volt AC inter connectable (with maximum 18 compatible