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X-Sense SD2J0AX 10-Year Battery Smoke Alarm, 10-Pack: specs and fit
A ten-pack of standalone photoelectric smoke alarms with sealed 10-year batteries, ETL listing to UL 217 and one-button test and silence. What to know.
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The X-Sense SD2J0AX is a battery-powered photoelectric smoke alarm, sold here as a pack of ten. That quantity suits landlords, multi-bedroom homes, or anyone fitting out several rooms at once. Each unit is standalone: it needs no wiring, no Wi-Fi and no hub, and it carries a sealed battery that X-Sense says lasts up to 10 years.
What photoelectric sensing means
Smoke alarms typically use either ionization or photoelectric sensors. Photoelectric alarms detect smoke particles that scatter light inside a small chamber. They generally respond well to slow, smouldering fires, and they tend to be less troubled by cooking fumes and steam. X-Sense says this sensing helps reduce nuisance alarms, so the alarm interrupts daily life less often.
The 10-year sealed battery
A lithium battery is built into each alarm and cannot be changed. X-Sense says it powers the alarm for up to 10 years, helping reduce battery replacements and low-battery chirps. The trade-off is that you replace the whole alarm at the end of its service life, so it is worth writing the installation date on the unit or in a household log. Check the manual for the exact replacement timing.
Certification and alerts
The listing says each unit is ETL listed to UL 217, the North American standard for smoke alarms. It has a loud local alert and an LED indicator. X-Sense suggests bedrooms, hallways, living rooms and basements as locations. Local codes vary on how many alarms are required and where they must be placed, so follow your local requirements and the manual.
Test and silence
A single button runs the self-test and also silences a nuisance alarm. Testing regularly, as the manual advises, is one of the most useful habits with any smoke alarm. Silencing is only for situations you can confirm are harmless, such as burnt toast.
Installing a batch
X-Sense says each alarm mounts in minutes with the included hardware, with no electrician required. With ten units, a simple plan helps: walk the home, decide on locations from the manual's guidance, and label each alarm with its install date. Each unit measures about 4.7 x 2.8 x 4.7 inches, and the pack weighs around 4.5 lb in total.
Standalone, not interconnected
These alarms work independently. They have no Wi-Fi, no app alerts, no base station use and no wireless interconnection. When one sounds, the others do not. X-Sense names its SD19-W as its wireless interconnected model for people who want alarms that sound together.
Who it suits
It suits rentals, family homes, and anyone replacing a number of older alarms in one go. It is not the right choice if you want linked alarms or phone notifications.
What to check before you buy
- How many you need: count bedrooms, hallways and levels, and check your local code.
- Interconnection: decide if you need alarms to sound together.
- Existing mounting: see whether the old alarm's bracket location suits the new one.
- Replacement date: record the installation date for each unit.
- Carbon monoxide: this is a smoke alarm only, so check whether you also need CO protection.
The short version
- A ten-pack of standalone photoelectric smoke alarms.
- Sealed lithium battery rated by X-Sense for up to 10 years.
- ETL listed to UL 217, with a loud alert and LED indicator.
- One button to test or silence; no wiring needed.
- No Wi-Fi or interconnection; follow local codes and the manual.
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