10 x SITERWELL Hardwired Smoke Detector Interconnected + 9V Backup Battery
If the smoke alarm is in normal working condition, the green LED light is always on and the red LED light flashes every 40 seconds. If low battery there will be a signal alarm, which informs you to change a new battery.
2 x SITERWELL Hardwired Smoke Detector Interconnected with 9V Backup Battery
If the smoke alarm is in normal working condition, the green LED light is always on and the red LED light flashes every 40 seconds. If low battery there will be a signal alarm, which informs you to change a new battery.
2 x SITERWELL Hardwired Smoke Detector Interconnected with 9V Backup Battery
2 x SITERWELL Hardwired Smoke Detector Interconnected with 9V Backup Battery. Condition is New. Shipped with USPS Ground Advantage.