Round white smoke, heat, and carbon monoxide alarm with its blue and white packaging.

Spec+ Multi-Sensor Smoke, Heat & CO Alarm next to its blue and white packaging box.

Hand installing a Spec+ Multi-Sensor Alarm on ceiling; icons and compliance text shown at left.

Spec+ Alarm: Bluetooth link, lithium battery, insect mesh, dust compensation.

Hand connecting wires to Spec+ Multi-Sensor Alarm with installation instructions visible.

Four Spec+ alarms with icons and descriptions, plus a ceiling-mounted detector shown above.

Spec+ Alarm features labelled heat sensor, test button, and LED indicator.

Person holds phone with SP540 app, showing diagnostics for Spec+ Multi-Sensor Smoke/CO Alarm.

Man tests a Spec+ Multi-Sensor Smoke, Heat & CO Alarm on the ceiling of a modern living room.

SP540

Spec+ Multi-Sensor Smoke, Heat & Carbon Monoxide Alarm

Name: Spec+ Multi-Sensor Smoke, Heat & Carbon Monoxide Alarm
Brand: FireAngel
SKU: SP540
Availability: InStock

Complete protection in one alarm

The Spec+ Multi-Sensor is a Grade D1 alarm combining smoke, Class A1 heat and carbon monoxide detection, helping meet BS 5839-6 requirements while reducing the need for multiple devices.

Designed for professional installations, it supports efficient specification across domestic, social housing, HMOs, new build and private rented properties.

With AC mains power and a rechargeable lithium backup, it maintains protection during power interruptions, helping reduce risk and support compliance. Built-in Bluetooth Low Energy (BLE) interlink comes as standard, with optional hardwired connection for flexible interconnection and coordinated alerts.

UltraSense™ sensor
Bluetooth Low Energy
Smart silence
Quiet self-test
Alarm memory
Sleep Easy™
Night sensing
Low-battery warning
Fault indication
End-of-life warning
Bug mesh
Dust compensation

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GET IN TOUCH PRODUCT SUPPORT

The Spec+ Multi-Sensor is a Grade D1 alarm combining smoke, Class A1 heat and carbon monoxide detection, helping meet BS 5839-6 requirements while reducing the need for multiple devices.

Designed for professional installations, it supports efficient specification across domestic, social housing, HMOs, new build and private rented properties.

Installation & setup

Get the help and support you need to easily set up and install your FireAngel alarm for instant protection.

Installation guide

Click the icon to view best practice guidance for installing FireAngel alarms

Maintenance guide

Click the icon to find out how to maintain and test your alarm

Resources

For more technical and specification information on this alarm, view our manual and datasheet.

Product manual

Click the icon to download the product manual

Datasheet

Click the icon to download the product datasheet

Key features and benefits

Triple detection in one unit

Delivers smoke, heat and CO protection in one unit, simplifying installs

Lever clip installation

Pushlock AC terminal block reduces installation time

Bug mesh & dust compensation

Designed to reduce nuisance alarms and improve longevity

AC power with rechargeable lithium backup

Grade D1 alarm ensures continuous operation during power outages, keeping properties protected. Includes 10-year rechargeable lithium battery to maintain protection during power interruptions

Installing Spec+

The Spec+ Multi-Sensor is a Grade D1 alarm designed for efficient installation across a wide range of property types. Its compact design and standard mounting allow for quick, consistent fitting in both new build and retrofit applications, helping reduce time on site. Approved for use in Scotland under the Scottish Tolerable Standard, it meets BS 5839-6 requirements for domestic installations.

Suitable for installation in open-plan kitchen and dining areas, bedrooms, hallways, and landings, the Spec+ range supports flexible placement throughout the property. BLE Interconnection capability allows up to 50 devices to be linked for whole-building coverage, making it well suited to HMOs, social housing, and multi-occupancy buildings requiring a coordinated alarm response.

With a 10-year lifespan and compliance with current safety standards, it provides a reliable, long-term solution for professional installations across multiple property portfolios.

Compliant and certified for safety

The SP540 / FA4453BW-T Spec+ Multi-Sensor Alarm meets recognised standards for smoke, heat, and carbon monoxide detection.

Smoke alarm certified

Tested and certified to EN14604 for domestic smoke detection

Heat alarm certified

Tested and certified to BS 5446-2:2003 for domestic heat detection

Carbon monoxide certified

Tested and certified to EN 50291 for CO detection

SGS independently tested

Verified for reliable and consistent heat detection by the world’s leading Testing, Inspection and Certification company

10-year warranty

Manufacturer-backed cover for a full decade of protection and support

What's in the box?

Person scanning a Spec+ Multi-Sensor Smoke, Heat & CO Alarm box with mobile on cluttered table.

Everything supplied with the SP540 Multi-Sensor Smoke, Heat & Carbon Monoxide Alarm

✓ Smoke, heat and carbon monoxide alarm unit
✓ Ceiling base plate
✓ Screws and wall plugs
✓ Dust cover (fitted)
✓ Installation and user guide

Reviews from our customers

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Related FAQs

Does the Spec+ range include a rechargeable battery?

Yes. The core five alarms in the Spec+ range are powered by standard household mains electricity and include a Panasonic rechargeable lithium backup battery. This ensures the alarm continues to operate during power outages, providing uninterrupted protection. The long-life battery is designed to last for the life of the alarm, reducing maintenance and eliminating the need for routine battery replacements.

Why does the Spec+ range use Bluetooth Low Energy (BLE)?

The Spec+ range uses Bluetooth Low Energy (BLE) to provide fast, secure wireless connectivity for simplified setup, device pairing and ongoing maintenance through compatible mobile apps and smart building systems. Exclusive to the FireAngel Professional range, BLE prevents interference or cross-connection with devices outside the network, ensuring reliable performance. It also enables up to 50 alarms to be wirelessly interconnected, delivering a coordinated whole-building response that makes the Spec+ range ideal for HMOs, social housing and other multi-occupancy properties.

What is UltraSense™ technology?

UltraSense™ technology uses an advanced dual-sensor chamber to provide fast, accurate detection of a wide range of fire types, including early-stage smouldering fires, liquid fires and fast-flaming fires. By combining the capabilities traditionally provided by separate ionisation and optical alarms into a single device, UltraSense™ delivers broader fire detection coverage and faster response times than single-technology alarms, helping to enhance safety while simplifying installation.

Why is the Spec+ range product certified by SGS?

The Spec+ range is certified to the same UKAS-recognised standards required for the UK market as products certified by other recognised bodies. FireAngel has chosen SGS as its certification partner because it is a globally recognised testing and certification organisation with over 150 years of experience, providing independent verification of product safety and performance.

What happens if the FireAngel Angel Pro app isn’t working?

The FireAngel Angel Pro app is designed to support installation, setup and diagnostics, but it is not required for the alarms to operate. The SP500 / SP510 / SP520 / SP530 / SP540 can all be installed and configured manually, ensuring protection is not dependent on the app. These are alarm-first products, with the app simply providing additional convenience, visibility and support for installers and customers.

See all faqs

UltraSense™ technology

UltraSense™ dual sensor chamber technology replaces the need for two separate alarms (ionisation and optical).

Bluetooth Low Energy

Bluetooth Low Energy (BLE) is a low-power wireless technology for short-range data transfer in IoT, wearables, and smart home devices.

Smart silence

Smart silence allows you to stop an alerting alarm from chirping for 10 minutes.

Quiet self-test

Quiet self-test checks your alarm at a volume at least 10dB below full level without disturbing others. Double-press for a full 85dB test.

Alarm memory

Alarm memory lasts 7 days. LED flashes for the first 3 days. Press test to recall events or hold 10s to clear the memory.

Sleep Easy™

Sleep Easy™ stops low battery beeps overnight without compromising smoke or carbon monoxide protection.

Night sensing

Automatically detects low ambient light levels and adjusts the alarm’s indicators or behaviour during night time hours.

Low-battery warning

When the battery is low, the yellow fault LED will flash once with a chirp every 40 seconds.

Fault indication

The alarm performs regular self-tests. When a fault is detected, the yellow LED will flash twice with 2 chirps every 40 seconds.

End-of-life warning

When the alarm reaches the end of its life (EOL), the yellow LED flashes with 3 chirps every 40 seconds. The alarm must be replaced within 30 days.

Bug mesh

Bug mesh prevents small insects and debris from triggering the alarm.

Dust compensation

Dust compensation reduces nuisance alarms caused by dust buildup in the photoelectric chamber while maintaining smoke alarm performance.

Spec+ range

See our full product offering here.

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Compliant innovation

FireAngel Spec+ is a complete Grade D1 fire and carbon monoxide alarm portfolio, developed for UK housing professionals and aligned with BS 5839-6.

Combining advanced sensing technology, integrated connectivity and installer-friendly design, Spec+ helps housing providers, contractors and specifiers protect residents while simplifying installation, maintenance and long-term compliance.

Backed by FireAngel’s Design Service, CPD training and dedicated technical expertise, Spec+ provides the support needed to specify, install and manage fire safety systems with confidence.