# X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery

Sealed: X-Sense SD11 smoke alarms are a two-pack of battery-powered detectors with magnetic mounting and a claimed 10-year battery life. The listing also describes a test/silence button and self-tests, while stating that these alarms do not support app functions or interconnection.

- [Original product page](https://bargainpostbox.co.uk/product/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [View offer](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: X-Sense
- Model: SD11
- Category: Electronics > Smart Home & Security > Alarms & Sensors
- Price: 21.58 GBP
- Previous price: 29.99 GBP
- Discount: 28%
- Price checked: 2026-11-14T09:52:15.800Z
- Rating: 4.4 / 5
- Reviews: 1007

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Magnetic mounting is presented as an option alongside screw installation.
- The manufacturer claims a sealed battery life of 10 years and a sensor life of 10 years.
- A large button is described for testing or silencing the alarm. The listing also claims self-tests every 60 seconds for faults or low battery.
- The listing says the SD11 does not support interconnection or app functions and is not compatible with the SBS50 base station.

## Pros

- The two included magnetic adhesive pads offer a mounting option that avoids drilling, according to the listing.
- The claimed 10-year sealed battery avoids routine battery replacement during its stated life.
- The test/silence button and claimed regular self-tests provide onboard controls and status checking.

## Cons

- The alarm does not support app functions or interconnection, limiting remote monitoring and linked-alarm use.

## Specifications

### Identity
- Brand: X-Sense
- Model: SD11
### Power and battery
- Power configuration: Battery Powered
### Dimensions and installation
- Dimensions listed: 12.2D x 12.2W x 4.5H centimetres
- Weight listed: 356 Grams
- Mounting style: Magnetic Mount
### Materials and protection
- Material listed: Fireproof ABS
- Operating humidity: ≤85%
### Listed features
- Alarm sound level: 85 dB

## Before you buy

- The 10-year battery and sensor-life figures are manufacturer claims, not independently verified guarantees. Follow the product instructions and applicable local guidance for alarm placement and maintenance.

## In the box

- 2 SD11 smoke alarms (Included)
- 2 magnetic adhesive pads (Included)
- 2 CR123A batteries (Included)
- 4 screws (Included)
- 4 wall plugs (Included)
- 1 instruction manual (Included)

## A good fit for

- Buyers seeking two standalone smoke alarms with magnetic mounting and no routine battery replacement claimed for ten years.
- Households that want an onboard test/silence button and do not need app control or interconnected alarms.

## Less suited to

- Buyers who need smoke alarms to link with each other, connect to an app or work with the SBS50 base station.

## Customer feedback

Customer feedback highlights ease of installation and appreciation for the magnetic attachment. Battery-life reports are mixed, with some describing long life and others reporting a dead battery. Durability and alarm loudness also receive mixed feedback. These experiences are relevant to the listing's magnetic mounting and sealed-battery claims, but do not establish how an individual unit will perform.
- Positive themes: Customers describe the alarm as easy to install.
- Mixed feedback: Battery-life feedback is mixed, including reports of a dead battery.
- Mixed feedback: Durability and noise level receive mixed feedback.
- Mixed feedback: Although some customers appreciate the magnetic attachment, feedback about it is also mixed.

## Frequently asked questions

### Does the X-Sense SD11 connect to an app or interconnect with other alarms?
No. The listing says the SD11 has no app function or interconnect function and is not compatible with the SBS50 base station.
### How is the SD11 mounted?
The listing describes magnetic adhesive pads for flat surfaces and screw installation as an alternative. The package list specifies two pads, four screws and four wall plugs.
### How long does the battery last?
The title and product claims state a 10-year sealed battery life. This is a manufacturer claim rather than an independently verified guarantee.
### What does the alarm's self-test do?
The listing claims it checks for faults or low battery every 60 seconds. It also describes a button for testing or silencing the alarm.

## Alternative options

- [ELRO FS1801 smoke detector complies with European standard EN14604-4 pieces, pack of 4, White](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [X-Sense Wi-Fi Smoke and Carbon Monoxide Alarm, Voice Alerts, XP0A-iR,2-Pack \| with Replaceable Battery, Compatible with X-Sense Home Security App](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [X-Sense Smart Smoke and Carbon Monoxide Alarm with Voice Alerts, XP0A-MR11 \| Wireless Interlinked English Voice Alarm with SBS50 Base Station](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [ELRO FS1805 \| 2-Piece Smoke Alarm Set \| Magnetic Mounting Kit \| 5-Year Battery \| Complies with European Standard EN14604 \| White \| Set of 2](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [FireAngel FA6620 Optical, Battery Powered Fire/Smoke Alarms for Home \| 2-Pack, 10-Year Battery Smoke Alarm Detector, Replacing FireAngel ST-622/ST-620, Fire Alarms for Home](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [Smoke Alarm, 10 Years Battery, Smoke Alarms for Home, Fire Alarm with Mute Remotely Function,Big Test/Silence Button Smoke Detectors, Conforms EN14604, UKCA \(5pcs\)](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [X-Sense Wi‑Fi Smoke and Carbon Monoxide Alarm, App Control, SC07-WX, 1-Pack \| with Replaceable Battery, Smart Fire Alarm Compatible with X-Sense Home Security App](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [FireAngel FA6620 Optical, Battery Powered Fire/Smoke Alarms for Home \| 1-Pack, 10-Year Battery Smoke Alarm Detector, Replacing FireAngel ST-622/ST-620, Fire Alarms for Home](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [ELRO FS1801 \| 10-Piece Smoke Detector Set \| 10-Year Sensor \| Complies with European Standard EN14604 \| White \| Set of 10](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [Smoke Alarms for Home Pre-connected,10 Years Battery Life,Interlinked Smoke Alarms, Fire Alarms for Home Scotland Interlinked,Smoke Detector,Compliant with EN14604, CE Certified](https://bargainpostbox.co.uk/visit/wisualarm-s04-r8-three-piece-interlinked-smoke-alarms)
- [X-Sense 2 Pack Smoke Alarm for Home, 10-Year Battery and Lifespan, XS0G-SN \| Conforms to EN 14604 Standard, Test/Silence Button, Standby Without Flashing Light, Ultra-Thin](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [X-Sense Smart Smoke, CO & Heat Alarm Kit with Base Station, HSC131-MN \| APP Control, Whole-Home Protect, Magnetic Mounting for Smoke & Heat Alarms](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)

## Add-ons

- [X-Sense Wi‑Fi Smoke and Carbon Monoxide Alarm, App Control, SC07-WX, 2-Pack \| with Replaceable Battery, Smart Fire Alarm Comp](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)
- [X-Sense Smoke and Carbon Monoxide Alarm with Voice Alerts, XP0A-SR, 2-Pack \| with Replaceable Battery](https://bargainpostbox.co.uk/visit/x-sense-sd11-smoke-alarms-2-pack-b0f21d8nsd)

## Images

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 1](https://bargainpostbox.co.uk/i/uS51P2cnBzpLJhj6GD8KRaGcn453pP61xjx1jBxRgbfyaw_znhpKTVcTULwnEqcKauiojS_eZGgQzU6nAMQ07t-Y7DBk_2RwkXJI8MyEHFeJzB8qvk5gbQjn.jpg)

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 2](https://bargainpostbox.co.uk/i/KVvYNBqYzP4B_VPZ70noHEgcuN4r-Ed7xSiALIqbhUMOfrIYzNj7pDvNdk1NqvgbRCl4GdZ6A1uue_2ks3D3Bbnzn72d2JjeMd7pDp4ay4PiFhj4lVMR6Jtu.jpg)

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 3](https://bargainpostbox.co.uk/i/1XIkpwHMI6Tfbgi61DMiAKkw11l3RiXLA9d5iBRbjOgbB18ClWTm3PtS1s-ajJHgv3kyHA66HW2ogbcy2ntgyA_ikC1hadLHQ2xN1JLk5WYk7vC03l-2BX7w.jpg)

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 4](https://bargainpostbox.co.uk/i/64vlKv27jp7-F3CDYRERNS_izXAkccXbAw1Wyug_71xYaZIk8Pnpx0OSCN19DxFUuyCtJcULhucU_us7RPnFiXR4Fl0hBahUCnnM7ObCKJsCz2VgQFY2zvvn.jpg)

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 5](https://bargainpostbox.co.uk/i/wkrhF3OeuvFquxkJl_poJNCfYWyhKOWASu2Rq_4UcFPLFSPhOgaWfMQ6Cebj5I0N5LEyNb8CVSJyyqzfLJcarJtFscBnxLYGFjGqpm6V74N3p44nTZGBFi65.jpg)

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 6](https://bargainpostbox.co.uk/i/FuFbRihXfS-iS4l6I3Uf__6h1xh9Zhss1t8anf3ND-1YB5ZhPxsbmgWiaiIoKI7fc1Hwpxnu3Q0VNm567lWWAJsRj316ddzEgZTcoHZvDg1WXOJH21z_f6Z_.jpg)

![X-Sense SD11 Smoke Alarms, 2-Pack, 10-Year Sealed Battery — 7](https://bargainpostbox.co.uk/i/Ld8CJrkxtGK6b2jLY6oQOnMJsiVtmo9ORrQCeZbLvybrcZker2zUbIAQ2P45jD7XUMqZkwnIBUm_N3j7yiT41jiLn2mSvdr7nSAF2SzlrNczmob_RUhjYZ-_.jpg)