hop for alarm system offer wireless alarm system ,and its accessories like remote controls, glass break detectors, fire alarms, motion detectors, etc. Carbon Monoxide Detector
Bad guys they're not stupid. 
Usually they use plain scissors to cut house's phone line or the siren.
Then they will break the alarm keypad, as you know,they know it will disable most systems.
Nowadays ,they like that they can get to be in a nice silent house without working telephone lines . It isconvenient for them to crime. 
Why ? Why do alarm systems so easy to broken for burglars? These systems depend on phone lines, and the keypad contains the brains and a siren. They're easy for companies to make—and even easier for burglars to defeat.
AG-security alarm system have follow feature:
1. No phone lines to cut. They might cut wires on a house, but it will have no effect whatsoever on thesecurity alarm message going out. That's because we use a separate secure wireless signal to our monitoring centers.
2. They can smash the keypad all they want, but it does not contain the brains of our system. They THINK they've disabled the system, but in reality thesecurity base station has already alerted help.
All in all, security alarm system and its accessories should be install in home. Better life wait for your coming.