Ei3105RF Radio-Interlinked Optical Smoke Alarm - Safelincs - Approved supplier for Ei Electronics

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Radio-Interlinked Battery Powered Optical Smoke Alarm - Ei3105RF

More than 20 in stock
Save 23%
Now 39.99 inc VAT
33.33 ex VAT
Product Overview
The Ei3105RF is an entirely wireless, interconnectable optical smoke alarm from the Ei3100 series. If one alarm detects smoke, all alarms go off to give maximum warning time
  • Wireless, interconnectable smoke alarm. No base plate required
  • Battery powered smoke alarm (alkaline battery included)
  • A maximum of 12 units can be interconnected
  • Can interlink with all other EI radio-interlinked alarms (Please note: only the test function of accessories Ei411H and Ei410 will work with this unit)
  • 5 year Warranty
  • Kitemarked to BS EN 14604:2005
  • Suitable for installations complying to BS 5839-6: 2013 Grade F
  • CE marked
  • Suitable for home or office
  • RF range 150 metres (minimum) in free space and up to 30 metres in buildings. Larger buildings can easily be covered, as the units can act as repeaters (daisy-chaining)
  • Alarms that can be interconnected include:
    -   Ei3100RF, Ei3103RFU
  • Digitally coded to avoid interference with neighbouring systems
  • Hush button for false alarm control
  • Auto self-test feature continually monitors the sensor every 40 seconds for additional safety
  • No central alarm panel needed
  • Optional longlife lithium battery upgrade
  • Supplied with fixings; 2 x screws and 2 x rawl plugs
  • Please Note: These alarms are sold as individual units

The table below shows all the units that can interconnect with the EI3105RF.

Compatible Alarms
Model Number
Type of unit
Type of interconnection
Ei3103RFU Heat Radio-interlinked
Ei3100RF Ionisation Smoke Alarm Radio-interlinked
Ei168RC/Ei141 Ionisation Smoke Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei144 Heat Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei146 Optical Smoke Alarm Radio-interlinked using the Ei168RC base
Ancillary Products
Model Number
Type of unit
Type of interconnection
Ei407 Wireless Manual Call Point Radio-interlinked
Ei410T Remote Control Test Device Radio-interlinked
Technical Data

This is the technical data for the Radio-Interlinked Battery Powered Optical Smoke Alarm - Ei3105RF.

Product Code EI3105RF
Weight 0.22kg
Dimensions (HxWxD) 140x120x45mm
Battery Type 9V Alkaline
Sound Output 85dB (minimum) at 3m
Temperature Range 0 to 40C
Humidity Range 15% to 95% Relative Humidity

Data Sheets

FAQs (13)

Q. Do the Ei3100RF alarms require anything other than fixing to the ceiling to install them?

A. No, with this series of radio interlinked alarms there is nothing other than pressing the house code button required to install them.

Q. If the radio interlinking signal on one unit fails will the units still work as stand alone units.

A. Yes, should the radio interlinking signal fail the units will continue to sound independently should they detect a fire.

Q. Can a wireless router interfere with the radio interlinked alarms?

A. A wireless router is very unlikely to interfere with the signal of your radio interlinked alarms, as the RF signal of the smoke alarms is digitally coded.

Q. Do the radio interlinked units give out a constant signal all the time and does this decrease the battery life more than a non-interlinked alarm?

A. Yes, radio interlinked alarms are periodically sending and receiving signals from other units in the network and therefore the life of the battery is reduced. Units with alkaline batteries should have the batteries are changed annually [unless they are fitted with a sealed 10 year battery as eg in the Ei600RF series].

Q. Do I need to take out all the batteries in my radio-interlinked alarms before adding a new alarm into the system?

A. No, you do not need to remove all the batteries. Just simply press the house code button on all the units. Please ensure that the batteries have full power as this could render the house code process incomplete.

Q. Where more than one radio-interlinked battery operated smoke alarm is installed, if the battery in one alarm failed would the other alarms be affected?

A. If one alarm was to malfunction the other units would not be affected, if it was due to alarm failure. If the fault was with the radio-interlinking signal, then all alarms that are in the chain after the faulty alarm would be affected and they would not go off.

Q. If an EI3105RF alarm is installed in a thatch roof space and one is installed on the landing of the house, will the second unit sound should there be a fire detected in the roof space?

A. Yes that is correct, the radio frequency technology in these alarms allows them to be connected wirelessly. This is acheived by following the step by step house coding procedure in the instructions, the procedure ensures that all alarms in the series are 'tuned in' to each other allowing them to pass messages on. If a fire was to occur in your roof space the alarm located up there would sound and send a message to the alarm downstairs which would then sound to alert anybody in the premises.

Q. Are the battery radio-interlinked smoke alarms suitable to install in a four storey house with thick walls?

A. Our radio-interlinked smoke detectors have a radio frequency range of about 30 meters in buildings. This means that as long as the detectors are all within 30 meters of each other, the interconnection should be achieved. Some of the RF smoke alarms can also act as repeaters, which means that larger distances can be achieved. So, a four storey house should normally be suitable for RF install.

Q. Do batteries in radio-interlinked alarms expire quicker than those in normal alarms?

A. Batteries in radio-interlinked alarms do expire quicker than in other smoke alarms. RF smoke alarms are, however, also available with a 10 year sealed long life lithium battery. This battery will last for the 10 year life of the smoke alarm.

Q. Does the Ei3100 battery operated radio linked series have a hush button? If not how are false alarms dealt with?

A. There are three different alarms that make up the Ei3100 series. The Ei3100 optical alarm does have a hush button, which can be pressed to reset the alarm should a false alarm occur. The ionisation and heat alarms do not have hush buttons. Should either of these alarms trigger a false alarm, due to cooking fumes for example, the alarm can be silenced using a folded newspaper to fan underneath it. To identify which alarm has triggered the false alarm it is the unit with a rapidly flashing red LED.

Q. Is the Ei3105RF a complete smoke alarm or does it need a base?

A. The Ei3100RF series of battery operated smoke alarms are complete alarms, they do not require base plates to make them radio interlinked.

Q. Do the three types of Ei3103 alarms interconnect with each other?

A. Yes, the Ei3103 range, Ei3100RF - Ionisation Smoke Alarm Ei3105RF - Optical Smoke Alarm Ei3103RFU - Heat Alarm, interconnect with each other. If one sounds it will send a radio-signal to the other units and they will then be activated.

Q. Are there any restrictions to the distance a radio-interlinked smoke alarm will work?

A. Most radio-interlinked alarms have a range of 150 meters in an open space and up to 30 meters in buildings. The thickness of the walls and partitions will affect the travel distance of the signal.

Pricing & Availability

Model Stock Levels Price Weight
Product Code: EI3105RF Stock Level:
More than 20 in stock

39.99 inc VAT

33.33 ex VAT


Customer Reviews

13 customers have rated this product and it has an overall rating of 4.8 out of 5

All our reviews are written by real customers that have purchased this product from us and are publsihed without modification.

5 / 5 Stars

Reviewed by: MS

As described after advice over the phone.

Published on: 2nd October 2016

5 / 5 Stars

Reviewed by: GT

iam very pleased with the alarm easy to install and to pair great no problem aiarm it does what it says on the tin very pleased

Published on: 10th May 2016

5 / 5 Stars

Reviewed by: NL

A great service - very prompt delivery and a very good experience

Published on: 31st March 2016

4 / 5 Stars

Reviewed by: -

Easy to install and set up

Published on: 14th November 2015

5 / 5 Stars

Reviewed by: -


Published on: 23rd September 2015

5 / 5 Stars

Reviewed by: -

Easy installation, configuration & good value. Purchased this as an add-on to the EI3100KIT as an alarm in the other side of the L-shaped lounge/diner. Well worth the belt & braces value.

Published on: 17th January 2015

5 / 5 Stars

Reviewed by: -

Very pleased with the product. Excellent service. Extremely helpful staff. Thank you.

Published on: 6th April 2014

4 / 5 Stars

Reviewed by: -

tested it and it is working well

Published on: 24th January 2014

5 / 5 Stars

Reviewed by: -

Connects with other wireless alarms with no problems

Published on: 5th August 2013

5 / 5 Stars

Reviewed by: -

easy to set up easy to set up, easy to install

Published on: 10th July 2013

5 / 5 Stars

Reviewed by: -

Good product, easy to install & setup. Happy customer so far.

Published on: 10th May 2013

5 / 5 Stars

Reviewed by: -

Published on: 6th November 2012

5 / 5 Stars

Reviewed by: -

Published on: 16th August 2012

Show All Reviews

Delivery Options

The following delivery options are available on this product.

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Delivered in 2-3 working days by Royal Mail from 4.68 inc VAT - More info

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Delivered the next working day by UK Mail from 7.80 inc VAT - More info

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