SKU: 9262877285

Kidde KF21R Sentry Mains Powered Optical Smoke Alarm with Sealed-In Rechargeable Lithium Battery Back-Up c/w Quick Fit Base

$44.40 $49.33
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Description

Kidde KF21R Sentry Mains Powered Optical Smoke Alarm with Sealed-In Rechargeable Lithium Battery Back-Up c/w Quick Fit BaseKidde KF21R Sentry Mains Powered Optical Smoke Alarm with Rechargeable Lithium Battery Back Up The Kidde KF21R Sentry Optical Smoke Alarm is a high performance mains powered smoke detector designed to provide dependable fire detection throughout residential properties. Featuring an advanced optical sensor, the KF21R is ideal for detecting slow, smouldering fires commonly caused by upholstered furniture, electrical faults and cigarettes. Equipped with

Kidde KF21R Sentry Mains Powered Optical Smoke Alarm with Rechargeable Lithium Battery Back-Up

The Kidde KF21R Sentry Optical Smoke Alarm is a high-performance mains-powered smoke detector designed to provide dependable fire detection throughout residential properties. Featuring an advanced optical sensor, the KF21R is ideal for detecting slow, smouldering fires commonly caused by upholstered furniture, electrical faults and cigarettes.

Equipped with a sealed rechargeable lithium battery back-up, this alarm continues to operate during mains power failures without the need for battery replacement. The KF21R can also be interconnected with up to 23 compatible Kidde FIREX smoke, heat and carbon monoxide alarms, ensuring all alarms sound simultaneously when danger is detected.

Designed for straightforward installation, the alarm features Kidde’s Quick-Fit Slide-On Base for fast, tool-free fitting. The integrated cable management system helps maintain tidy wiring, while the 150mm flared base provides a neat finish during retrofit projects.

Key Features

  • Mains-powered optical smoke alarm with sealed rechargeable lithium battery back-up
  • Interconnects with up to 23 compatible Kidde FIREX alarms
  • Optical sensor technology for detecting slow, smouldering fires
  • Quick-Fit Slide-On Base for fast, tool-free installation
  • 150mm flared base plate for neat retrofitting
  • Integrated cable management for secure and tidy wiring
  • Alarm memory identifies the activated unit within the network
  • Combined Test/Hush button for easy testing and temporary silencing
  • Automatic reset after alarm activation
  • Tamper-resistant locking mechanism for added security
  • Suitable for lofts, hallways, bedrooms and living areas
  • Fully compatible with Kidde FIREX smoke, heat and CO alarms
  • 10-year manufacturer warranty

Ideal Applications

The Kidde KF21R optical smoke alarm is recommended for installation in:

  • Hallways and circulation routes
  • Bedrooms
  • Living rooms
  • Attics and loft spaces
  • Residential Grade D1 fire alarm systems

Optical smoke alarms are particularly effective at detecting slow-burning fires and are ideal for escape routes and living spaces.

Technical Specifications

  • Model: KF21R
  • Power Supply: 230V mains with sealed rechargeable lithium battery back-up
  • Sensor Type: Optical with dust compensation and bug screen
  • Alarm Volume: Minimum 85dB at 3 metres
  • Alarm Frequency: 3.2 kHz typical
  • Interconnectivity: Up to 23 compatible alarms
  • Alarm Grade: D1
  • Approvals: BSI certified to BS EN14604:2005
  • Dimensions: 150mm x 150mm x 53mm
  • Weight: 260g including battery
  • Operating Temperature: -10°C to +40°C
  • Humidity Range: Up to 93% RH non-condensing
  • Warranty: 10 Years

Compliance & Installation

The Kidde KF21R complies with UK Building Regulations and BS 5839 Part 6 standards for Grade D domestic fire alarm systems. Installation should be completed by a qualified electrician. For kitchen installations, a dedicated Kidde FIREX heat alarm is recommended instead of a smoke alarm.

Downloads

Data Sheet:
Download Data Sheet

Instruction Manual:
Download Instruction Manual

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 9262877285

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Reviewed in the United States on June 3, 2026
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Comfortable dress shoe.
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Reviewed in the United States on May 6, 2026
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Sam Beckett
Draper, US
★★★★★ 5
Tropical Fringe Fun for My Summer Outfits
Color: Natural, Color: Natural
I am absolutely obsessed with this straw purse because it feels like a vacation in my hand. The first thing I noticed is how the raffia fringe has this playful half moon shape that looks like a little lion mane but in a very high fashion way. My daughter even joked that it looks like a giant fancy taco which makes it such a fun and unique piece to carry around. It is incredibly lightweight which is a huge relief because I do not want to carry a heavy bag when the weather is hot. Even though it looks compact on my mannequin, it is surprisingly roomy inside and fits my phone and all my daily essentials without feeling stuffed. The magnetic closure is quite strong so I do not have to worry about my things falling out while I am walking around a summer party or a night out. The neutral tan and cream colors in the fringe make it very easy to match with almost any outfit I own. I really appreciate the small metal brand patch on the front because it gives the bag a more polished and expensive look than a typical straw tote you might find at a souvenir shop. One thing to keep in mind is that the raffia is very textured so you should probably be careful with delicate silk fabrics so it does not snag. It feels very sturdy and well made for something that is woven from grass and I love how the fringe adds so much movement when I am moving around. This bag is definitely going to be my go to accessory for the rest of the season because it is both stylish and very practical for my needs.
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Reviewed in the United States on April 2, 2026
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Queen Of Nightlife
Omaha, US
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👜 Effortless Spring-to-Summer Clutch That Feels One-of-a-Kind
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👜 Effortless Spring-to-Summer Clutch That Feels One-of-a-Kind I’ve been a longtime fan of Sam Edelman, especially because they actually make stylish pieces that work for real life. So when I saw this clutch, I had a feeling it would be good… but I didn’t expect it to hit *this* level. This bag is a vibe. The raffia texture and that half-moon fringe give it such a unique, standout look without trying too hard. It feels like the perfect piece to roll right into spring and carry straight through summer. Think beach days, dinners out, travel nights, all of it. What I love most is that it doesn’t look like everything else out there. It feels original, like you found something special instead of just grabbing another basic clutch. It’s lightweight, easy to carry, and the magnetic closure keeps things simple and secure. It also pairs effortlessly with different outfits. You can dress it up or keep it casual and it still works. Now let’s be real, it’s a designer piece, so it’s not cheap. But for the style, quality, and uniqueness, I do think it delivers strong value for money. Five stars from me. This one’s coming with me everywhere this season ☀️
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Hidd
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