Get a YALE 6400 telecommunicating alarm and a 6200 alarm combined and save money.
This is the cheapest way to get a fully comprehensive system.
Total devices would be -
Telecommunicating control panel with inbuilt siren.
Remote keypad controller with pin code allowing alarm control remotely from either an extra entry/exit point or control from the upstairs.
4 x pir sensors
4 x door.window contacts
2 x external sirens with working sirens
plus extra dummy siren for garage or outbuilding.
This system represents excellent value for money for a large detatched residence.
Combined price is the equivalent of getting a 6400 for only £164 and a 6200 for £94
BOTH alarm kits for only £258