BRK Brands 9120 Hardwire Smoke Alarm

• 120-volt hardwire ionization smoke alarm
• Uses Smart Technology to reduce nuisance alarms
• Features convenient silence/test button, dust cover, 85-decibel alarm
• Latching alarm indicator identifies which unit triggered alarm
• 10-year limited warranty

Amazon.com Product Description:
Introducing the revolutionary BRK 9120 series smoke alarms which have been redesigned from the ground up. They install faster, perform better, and are even smarter than before. All of these improvements help reduce nuisance alarms and save you time and money. BRK Electronics smoke alarms are designed to be easy to install, easy to maintain, and quality-engineered for years of virtually maintenance-free service. The AC-powered BRK Hardwire Smoke Alarm includes these features: Ionization sensor which helps detect fast flaming fires that consume combustible materials rapidly. 120-volt AC inter-connectable with up to 12 smoke alarms and six of a combination of UL listed BRK heat alarms and RM3 relays (maximum 18 devices). Smoke and CO alarms must be interconnected separately per NFPA 72 and UL 217. Latching alarm indicator which automatically identifies which unit initiated the alarm. Smart technology to reduce nuisance alarms. Single test/silence button which both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality. Perfect mount system including a gasketless base for easy installation and new mounting bracket that keeps the alarm secure over a wide rotation range to allow for perfect alignment. Mounting bracket lock for tamper resistance. Dust cover to keep unit clean during construction. 10-year limited warranty. All BRK Electronics smoke alarms meet UL 217 standard and are listed with the California State Fire Marshal. They use the new UL mandated repeating 85-decibel alarm horn pattern. 10-year limited warranty. This unit is approved for sale in Oregon after new revisions on law HB2586.--Bree Norlander What's in the Box One smoke alarm and user's manual

Not the model pictured:
The product pictured has a battery door which is the 9120B, not the 9120 as labeled (and shipped to me). This model is hard wired like the 9120B, but is missing the battery backup. Without a battery backup the smoke detector will not work in case of a power loss. I'm not quite sure why thy make a model like this, but for me it is useless and now I have to ship back the product because Amazon did not appropriately represent the product.

Smoke alarm:
This model replaces the original BRK 4120's that my home was equipped with when it was built 9 years ago. Slowly but surely, I am having to replace ALL the smoke alarms in the house.

Good item!:
I have a family with five children in a two story house (bedrooms upstairs). I have nine of these wired together in my house. I put the system in about 10 years ago. I put a lighted "on/off" switch in the kitchen beside the hallway to the second story bedrooms. When the system has tripped due to cooking or some other smoke incident in the house we can shut the alarms off till the air clears. This has worked really well over the years. My biggest concern for the family safety is at night when we are all tucked in bed and asleep. With the battery powered units (BRK-9120B) you cannot turn the system off with a switch so if all are wired together and an incident happens you have to put up with the alarms (all) till they go off. UGH!! The only drawback I have with these is that they wear out but then I knew that when I put them in.