What are people's recommendations for main and/or battery smoke alarms?

I want them interconnectable, but the only ones I already have (Dicon,
battery operated) interconnect using 2 core cable and it would seem that
some mains powered interconnectable may use only one wire as a 'signal'
line.

Anyone know? The ones I am looking at are ScrewFix http://tinyurl.com/xwxf

Also, I saw someone post recently where to put Ionisation and where to put
Optical but cannot find the thread.

That said, SF's Opto and Ion detecters are different brands so may not work
together. Any experience anyone?

Thanks
Rob

Kalico wrote:
Anyone know? The ones I am looking at are ScrewFix
http://tinyurl.com/xwxf

May be worth spending the extra £2 each and getting the ones that also have
9 volt batteries included. The SF ones seem to work OK and are easy to wire
with some 3+E for the L N and signal.

--
Toby.

'One day son, all this will be finished'

"Toby" wrote in message
...
Kalico wrote:
Anyone know? The ones I am looking at are ScrewFix
http://tinyurl.com/xwxf

May be worth spending the extra £2 each and getting the ones that also
have
9 volt batteries included. The SF ones seem to work OK and are easy to
wire
with some 3+E for the L N and signal.

--
Toby.
Thanks for that Toby. It is interesting that there is hardly any difference
on price for single units but when buying 3 the difference is much bigger.