Quick check list for you for wirefree
2 way wirefree
SSAIB or nsi installer
Long standing company
Batteries changed as part of the service
Companies proximity to you
If the company ticks all the boxes go for them. A couple of things to be aware of if you want monitoring. If you want police response you will need more detectors to work properly. You will also need to have the alarm reset after an activation. Some companies charge for this. If you want key holders only you will just get a phone call to say the alarm has gone off. Either way for better security you will be better of with dual path signalling