Good alarm systems are tamper-proof and can be set up and expanded on a modular basis. They can be combined, for example, with glass breakage detectors, window sensors, door sensors or surveillance cameras, as well as with gas, smoke, temperature or water level detectors, and can be remotely controlled via a smartphone or tablet. In addition, modern alarm systems can be integrated into a smart home system and networked, for example, with a wristband transmitter, drop sensor or emergency call button that immediately summons help in an emergency.