10 Year Multi-Sensor Smoke Alarm

10 Year Sealed Lithium Battery

Battery powered Thermoptek Smoke Alarm has been designed to simplify protecting properties against fire. Sensing technology that offers a faster reaction to all types of fires and reduces nuisance alarms.


Grade F1 as recommended by BS 5839-6

5 Year Warranty

For peace of mind




Our datasheet and manual contain guidance on the product and the latest standards - if you have any additional questions, our team of experts can offer all the support you need, so get in touch!


Installation Support and Guidance


Specification Detail and Standards.




This alarm cannot be interlinked to other alarms in a property, but still offers a high protection against fire. Follow the installation guide to ensure alarm is installed correctly and test weekly.


Testing and maintenance support.

Patented technology Thermoptek

Multi-Sensor alarms are recognised as an enhancement within British Standards BS 5839-6. Our unique patented Thermoptek technology combines the latest optical sensing with thermal enhancement for rapid detection to all fires.

Battery Powered Quick and Easy Installation

The unit comes with a sealed, tamper proof battery that will last the lifetime of the alarm. The sensor life is 10 years, so to ensure your properties remain protected we recommend you advise individuals to replace the unit after 10 years.

Quick and Easy Installation
Effective safety solutions Reliable Products

We are leading the way in home safety with state of the art design and technology to deliver the most reliable safety solutions. Our intelligent sensing technology is the trusted technology fitted by UK Fire & Rescue Services since 2007.

Reliable Products

Did you know?

Our Specification alarms interlink for enhanced protection Find out more

We’ve modernised the functionality of our range of Specification products to meet the demands of today’s Connected Home market. FireAngel Specification revolutionises the future of fire safety by offering smart wireless protection against Fire and CO in a single cost-effective system that can be adapted to suit the needs of each and every property.

Find out more


No, the ST-750 is a standalone battery-powered multi-sensor smoke alarm with no interlink options. This unit cannot be interlinked with any other products – please see our FireAngel Specification range or our FireAngel Mains with 9V battery backup range, both of these ranges offer hardwire and wireless interlink options.

According to latest BS 5839-6 standards, for maximum LD1 protection you should fit a smoke alarm in the following rooms: Hallway, Landing, Living Room, Bedroom, Airing / Meter Cupboards, Loft, Garage. A smoke alarm is not recommended for installation in a kitchen, you should install a heat alarm in kitchens.

For further guidance on BS 5836-6, please visit our Standards and Regulations Section.

Thermoptek technology combines the very latest in optical sensing with a thermal enhancement – it has two separate sensing elements. The different sensing elements constantly monitor for two different by-products for fires (smoke and temperature). If a rate of temperature rise is detected the sensitivity of the smoke alarm is increased. This provides a quicker response time to all fire types; fast flaming and slow-burning fires.

Whilst BS 5839-6 has previously been split into six varying Grades, each outlining the level of protection appropriate for certain properties and their corresponding levels of risk, the new update has altered the six sections, removing Grade B and Grade E, whilst Grade D and Grade F have been split into Grade D1 / Grade D2 and Grade F1 / Grade F2 respectively. Grade C has been revised and its recommendations expanded.

The 2019 grading system is as follows:

Grade A

Separate detectors, sounders and central control and indicating equipment with back-up power supply that conforms to British Standards BS EN 54.

Grade C

Separate detectors and sounders that are mains powered with back-up power supply and central control equipment.

Grade D1

A system of one or more mains powered detectors, each with a tamper‑proof standby supply consisting of a battery or batteries (such as FireAngel’s SM-SN-1 and HM-SN-1 alarm).

Grade D2

A system of one or more mains-powered detectors, each with an integral standby supply consisting of a user‑replaceable battery or batteries. (such as FireAngel’s SW1-PF-T and HW1-PF-T alarm).

Grade F1

A system of one or more battery-powered detectors powered by a tamper‑proof primary battery or batteries (such as FireAngel’s ST-622T, ST-750 alarm).

Grade F2

A system of one or more battery-powered detectors powered by a user‑replaceable primary battery or batteries. (such as FireAngel’s SB1-T alarm).
Please note: Grades B and E are no longer defined in BS 5839-6:2019.