Fit on average 3 a month with no problems.
Most are very easy to initialise but the cheeper (diy store) types can give
problems I have heard.
Just wire the panel to 240v (through a fused spur) run a 6core to the bell &
keypad.mount the detectors,initialise the panel and set for auto learn.
Fit batteries to devices and fit cover making tamper cct.
We use Risco group equipment but ADE ,Scantronics,Texecom and others all
supply radio alarms.
If you need more info plz repost.