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9V Interconnectable Optical Smoke Alarm - Ei105C

Discontinued Product

This product has been discontinued and is no longer available to buy.

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Product Overview
The Ei105C is an economical optical smoke alarm that can be linked with up to 12 other units.
  • Battery operated smoke alarm (alkaline battery included)
  • 5 year warranty on alarm
  • A maximum of 12 units can be interconnected via bell wire
  • Alarms that can be interconnected include:
  • Kitemarked to BS EN 14604:2005
  • Suitable for installations complying to BS 5839-6: 2013 Grade F
  • CE marked
  • Low battery alert
  • Test button 
  • Optional with longlife lithium battery
The table below shows all the units that can interconnect with the EI105C.

Model Number
Type of unit
Type of interconnection
Ei100CNP Ionisation Alarm Hard wire interconnect
Ei103C Heat Alarm Hard wire interconnect
Ei105C Optical Alarm Hard wire interconnect
Ei100TYC Ionisation Smoke Alarm with 10yr Battery Hard wire interconnect
Ei3105TYC Optical Smoke Alarm with 10yr Battery Hard wire interconnect
Technical Data
Product Code EI105C
Brand EI Electronics
Battery Type

9V Alkaline

Dimensions (HxWxD)


Operating Temperature

0 to 40°C

Relative Humidity

0% to 90% Relative Humidity

Sound Output


Weight 0.20kg
Product Datasheets

Customer Reviews

10 customers have given this product an overall rating of 4.7 out of 5

Reviews by real customers

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

Rating: 4 / 5 Stars

Reviewed by: p a

Perfect for the job and good price

Published on: 22nd December 2016

Rating: 5 / 5 Stars

Reviewed by: R N

Does what it says on the tin, although I have not had a fire to test it with.

Published on: 26th October 2016

Rating: 5 / 5 Stars

Reviewed by:

See above

Published on: 8th November 2015

Rating: 5 / 5 Stars

Reviewed by:

Good value does what it should

Published on: 27th September 2015

Rating: 5 / 5 Stars

Reviewed by:

A sound investment The product is easy to install and I like its shape. It is also easy to check the battery status.

Published on: 29th September 2014

Rating: 5 / 5 Stars

Reviewed by:

Easy to install sensitive interlinked facility good

Published on: 30th September 2013

Rating: 5 / 5 Stars

Reviewed by:

Feels solid and was easy to instal - no problems to date

Published on: 26th July 2013

Rating: 4 / 5 Stars

Reviewed by:

Published on: 12th October 2011

Customer didn't leave a rating

Reviewed by:

Connecting to an existing cable for interlinking was awkward because the terminals are placed underneath the detector. Unless there is plenty of slack cable available connection when working close to the ceiling was difficult as there may be little room to work a screwdriver. Side terminals would be easier to access.

Published on: 31st January 2011

Rating: 5 / 5 Stars

Reviewed by:

no problems easy to fit and test

Published on: 3rd October 2010

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