Hi
We had abreak in at work and in true ”shut door after horse has been exported to europe and stripped for parts ” fitted an alarm
Its a Yale 6400 . Wireless system. 2 x PIR + 2 door contacts. Rings 3 numbers in sequence till cancelled if an alarm is activated.
plugs into mains , and a phone jack. Can be set to home alarm mode , so you could use this for your garage sensors so at night they only are active.
Very easy fit and set up . tamper proof box , dummy box, tamper proof pir’s and door contacts . 30m range to furthest sensor . We only went 15m not through walls so not sure how far these work , depends on where your garage is i guess.
£150ish from screwfix , and its upgradable with more sensors , smoke alrm etc . Its also powerfully loud .