Wireless burglar alarms are better than wired intruder alarms. There is not point in running wires these days. Wireless alarms are now made by every mojor company and they would not risk thier good name on products not fit for purpose. The major supplier is
http://www.quicksafe.co.uk who offer a range of DIY and fully installed burglar alarms. Some of the new alarm systems can be monitored and controlled via SMS text message these systems are called GSM alarms after the GSM dialler inside them. They take a pay as you go SIM card and work with any network. Most house alarms and home alarm systems come in kits with control panel 4 detectors and an external siren.