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Description
Kidde Firex 4x KF20LL Optical Smoke & 1x KF30LL Heat Alarm Kit Mains Powered with Long-Life 9V Lithium Battery Back-UpKidde Firex 4x KF20LL Optical Smoke & 1x KF30LL Heat Alarm Kit Mains Powered with Long Life 9V Lithium Battery Back Up FULLY COMPLY WITH THE NEW 2022 SCOTTISH & WELSH REGULATIONS 4x Mains Powered Optical Smoke Alarm (KF20LL): Mains Optical Smoke Alarm Features: Mains powered optical smoke alarm that can be interlinked with up to 23 other Kidde mains alarms, be they ionisation, optical or heat. Once interlinked, the detection of the relevant danger by
Kidde Firex 4x KF20LL Optical Smoke & 1x KF30LL Heat Alarm Kit Mains Powered with Long-Life 9V Lithium Battery Back-Up
FULLY COMPLY WITH THE NEW 2022 SCOTTISH & WELSH REGULATIONS
4x Mains Powered Optical Smoke Alarm (KF20LL):
Mains Optical Smoke Alarm Features:
Mains-powered optical smoke alarm that can be interlinked with up to 23 other Kidde mains alarms, be they ionisation, optical or heat.
Once interlinked, the detection of the relevant danger by an individual unit will sound across all the connected alarms.
Optical alarms are for use in escape or circulation routes and in areas where there is a danger of ignition of furniture and surroundings by cigarettes producing slow, smouldering fires.
This mains-powered unit should be installed by a qualified electrician and can be used throughout the home, except in the kitchen where a Firex Heat Alarm is recommended. These alarms comply with UK Building Regulations for new housing and associated standards (Grade D BS 5839, Part 6).
- Interlink with up to 23 Firex hard-wired alarms – all alarms sound if danger is detected
- Alarm memory – identifies source unit within interconnecting network
- Combined Test/Hush button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms
- Auto reset after activation
- Tamper-resistant locking device – prevents unauthorised removal without the use of a tool
- Mains operation – 9V Lithium back-up battery supplied as standard
Mains Optical Smoke Alarm Specification:
- Model KF20LL
- Power Supply 230V mains-powered with 9V Lithium battery back-up
- Temperature Range 0ºC to + 40ºC
- Humidity Range Up to 93% Relative Humidity (RH) non-condensing
- Storage and Transport -20ºC to +60ºC and 5–95% relative humidity (RH) non-condensing
- Alarm Dimensions 127 x 127 x 39mm
- Bracket Dimensions 133 x 133 x 6mm
- Alarm Weight 242g
- Warranty 6 years
- Approvals BSI certified to BS EN14604:2005
- CE tested and certified Sensor Optical, circular lateral chamber with insect-resistant width slot entry portals and added bug screen mesh
- Chamber Size 35mm outside diameter x 16mm depth approximate (external)
- Detection Band Infrared light wavelength
- Button Test Simulates the effect of smoke within the sensing chamber, checks electronics and sounder
- Automatic Self-test Circuitry is tested and unit beeps (chirps) if fault is detected
- Supply Voltage 230V AC, 50 Hz (nominal UK voltage)
- Power Consumption < 15mA
- Connection Push-in/snap-fit type connector with 150mm long flying leads (supplied)
- Battery Back-up User-replaceable alkaline 9V battery (522/6LR61)
- Power-on Indicator Continuous green LED
- Alarm Sounder Electronic piezo-electric sounder (T3 pattern sound - 3 pulses - space - 3 pulses), soldered contacts
- Sound Output 85dB (A) minimum at 3 metres
- Alarm Frequency 3.2 kHz typical
- Dust Protection In-built foam gasket in rear of alarm to prevent dust ingress into rear of the alarm
- Alarm Status Red LED flashes approx once every five minutes = normal operation
- Red LED flashes once a second = sensing smoke (sounder alarm sounds)
- Red LED flashes once every ten seconds = in hush condition (auto-reset after 15 minutes)
- Interconnection Up to 24 Firex and Kidde ‘Slick’ units (smoke, heat and CO) can be hardwire interconnected with optional control (see below)
- Optional Controls Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units
- Optional Pattresses SMK23RU also has integral switchable relay for operating remote devices
- SMK4896 – Surface mounting base for added ease of installation
- Fixing Mounting bracket ring supplied with two ‘T’ slot fitting option
- 57mm spacing to a maximum of 90mm for standard screw fittings on back boxes
- Bracket has 50mm diameter central access hole for cabling
- Plastics used NORYL – Cover, main body and mounting bracket
- Lead-Free Status All Firex alarms are lead-free
1x Mains Powered Heat Alarm (KF30LL):
Mains Heat Alarm Features:
Mains-powered heat alarm that can be interlinked with up to 23 other Kidde mains alarms, be they ionisation, optical or heat.
Once interlinked, the detection of the relevant danger by an individual unit will sound across all the connected alarms.
Mains-powered heat alarms can be used throughout the home in humid or dusty environments where an optical or ionisation smoke alarm is unsuitable, e.g. kitchens, loft spaces and garages.
The Firex range requires installation by a professionally qualified electrician and complies with UK Building Regulations for new housing and associated standards (Grade D BS 5839, Part 6).
- Interlink with up to 23 Firex hard-wired alarms – all alarms sound if danger is detected
- Alarm memory – identifies source unit within interconnecting network
- Combined Test/Hush button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms
- Auto reset after activation
- Tamper-resistant locking device – prevents unauthorised removal without the use of a tool
- Mains operation – 9V Lithium back-up battery supplied as standard
Mains Heat Alarm Specification:
- Model KF30LL
- Power Supply 230V mains-powered with 9V Lithium battery back-up
- Temperature Range 0ºC to + 40ºC
- Humidity Range Up to 93% Relative Humidity (RH) non-condensing
- Storage and Transport -20ºC to +60ºC and 5–95% relative humidity (RH) non-condensing
- Bracket Dimensions 127 x 127 x 39mm
- Alarm Dimensions 133 x 133 x 6mm
- Alarm Weight 213g
- Warranty 6 years
- Approvals BSI certified to BS5446 Part 2: 2003
- CE tested and certified
- Sensor Thermistor (Thermal Resistor) within detection unit
- Button Test Simulates the effect of heat at the sensor, checks electronics and sounder
- Automatic Self-test Circuitry is tested and unit beeps (chirps) if fault is detected
- Supply Voltage 230V AC, 50 Hz (nominal UK voltage)
- Power Consumption < 15mA
- Connection Push-in/snap-fit type connector with 150mm long flying leads (supplied)
- Battery Back-up User replaceable alkaline 9V battery (522/6LR61)
- Power-on Indicator Continuous green LED
- Alarm Sounder Electronic piezo-electric sounder (T3 pattern sound - three pulses - space - three pulses) with soldered contacts
- Sound Output 85dB (A) minimum at 3 metres
- Alarm Frequency 3.2 kHz typical
- Alarm Status Red LED flashes approx once every five minutes = normal operation
- Red LED flashes once a second = sensing heat in excess of 58ºC (sounder alarm sounds)
- Interconnection Up to 24 Firex and Kidde ‘Slick’ units (smoke, heat and CO) can be hardwire interconnected with optional control (see below)
- Optional Controls Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units
- Optional Pattresses SMK23RU also has integral switchable relay for operating remote devices
- SMK4896 – Surface mounting base for added ease of installation
- Fixing Mounting bracket ring supplied with two ‘T’ slot fitting option
- 57mm spacing to a maximum of 90mm for standard screw fittings on back boxes
- Bracket has 50mm diameter central access hole for cabling
- Plastics used NORYL – Cover, main body and mounting bracket
- Lead-Free Status All Firex alarms are lead-free
Please note: Alarms are sold individually.
Data Sheet:
Data Sheet for KF20LLData Sheet for KF30LL
Instruction Manual:
Instruction Manual for KF20LLInstruction Manual for KF30LL
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.4 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Works Great, Use Daily, No Issues
Style: Alpha TT 25
While expensive, this product is rock-solid and has not given me a single issue over 2 years of use. Would buy again, highly satisfied. Can't beat the functionality or peace of mind of knowing right where our beloved family pet and hunting companion is located.
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Reviewed in the United States on November 2, 2025
★★★★★ 5
Great little radio, it was.
Great value for the price. I have received excellent audio reports on a couple repeaters I have tested on so far, on the first day with the radio. Love how you can customize all the display background and text colors. Tempature sensing fan works properly. Unfortunately, they do not send a programming cable with this radio, very annoying! It will not save offset and t-ctcs tone into memory mode when programming by hand, which is unfortunate because it is easier to program by hand than some other cheap radios, like the Baofeng keypad. I really wanted to upload all my channels via Chirp, and to make sure Chirp is actually supported before posting review, but it is what it is, and now I have to find a proper programming cable, then hope I did not pick one that does not work. Other than this very disappointing fact, this radio is well worth the money and I highly recommend if you are on a budget or just getting into the hobby. I have mainly been working HF since getting my General ticket and have made contact all over the world, so you can rest assured this review is by someone who knows what they are talking about. Grab one while you can, you will not be disappointed, except for them not including a programming cable!
Edit: Have to return, squelch not working on second day. Right in the middle of a net, had to use monitor button to finish my contact. Turn monitor off and the receiver will not open squelch, which is set to 1. Can set squelch to 0 and receive but anyone who runs VHF/UHF knows that, unlike HF, an open squelch is just too noisy. Spent hours trying to fix, no joy!
73, Stephen
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Reviewed in the United States on April 10, 2021
★★★★★ 5
Worth the money. Great backpack radio (manpack)
Love this little radio
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Reviewed in the United States on May 22, 2026
★★★★★ 4
Compact, loud, controls similar to Baofeng handheld, knobs aren't that great.
My first mobile rig, and currently the one I'm still using. I don't' use it too heavy, but I've had it for about 3 years and it's worked great. I've used it on many different applications
Pros: Compact size, good display, small fan on the rear to help keep the unit cool. The controls are very similar to a Baofeng handheld radio so great for beginners who likely started out with that brand. Compatible with GMRS, FRS, other "out of band" frequencies (mine was from the box, I can't guarantee the same with a newer model though). Do this at your own "risk," you are an adult and can make your own choices :)
Cons: Fan is a bit loud if that's something that bothers you during a long QSO. Repeater tail squelch is loud at times. But the biggest con by far is the knobs are garbage. They are rubber, and you will most certainly have one fall of at some point and loose it. I purchased some small guitar amp knobs and replaced the (now both lost) factory knobs. If the knobs were metal or fixed to the device I would give 5 stars.
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Reviewed in the United States on February 9, 2026
★★★★★ 1
junk
radio runs hot even when not transmitting. programming cable does not work with win 11. it does work with chirp once you find a 10 year old pc to program it. programming from the front panel seems impossible. knobs are made of rubber and keep falling off. i am sure i will find more once i use it for a while if it lasts.
Update: I was able to trudge through the manual and make the changes i needed from the front panel, took a while with the darn buttons falling off. Manual is not good but with some patience you can work through it. If you need a tiny radio and your budget allows i would look at the anytone 778.
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Reviewed in the United States on February 7, 2024