Wireless interconecting smoke alarms.
These were £12.99 each for both the rf transmitting & receiving base and the smoke alarm today I bought them
for alarm £4.99 and the transmitter £9.99.
The alarm can be used on the own but with the transmitter it will send a signel to all the other alarms and they will all go off. So if you have a large house one in the kitchen, livingroom, bedrooms, and one in your bedroom then if one goes off downstairs then everyone will know.
If you buy 3 sets of alarms £44.94 then there is a handling charge of £5.95 but add a drill bit or somthing then items over £45 is free
10530 10yr Lithium Battery Smoke Alarm
10754 RF Base
These are the item numbers
£24 = £12 per item was the cost originally now down to £15 for both