Wireless Alarm System have more capabilities than wired alarms. Because you're using a mobile network, you can set up some wireless systems to notify the landlord when someone enters the house. This is ideal for parents who want to ensure that their child has safely returned home.
If you're looking for a wireless alarm system, make sure it's encrypted to avoid hacking. A hacker can use cheap Software Defined Radios (SDRs), which are tiny TV-tuner dongles that plug into laptops, to intercept signals sent by the alarm system or control pad. If the wireless alarm system lacks strong data encryption, it could be hacked by a hacker, so choose a high-quality product with up-to-date firmware and software.