There are various devices used in home security systems to detect intruders and trigger a burglar alarm, such as door and window, motion, and other hardware.
A medical alert device, also known as a personal emergency response system (PERS), is valuable for individuals, particularly those with medical conditions, at risk of falls or emergencies.
Some security systems do not require an internet or landline connection. Systems not connected to external communication are called "offline" or "standalone."