RAD-A4291/100 is a personal security system from Stonecold (formerly Securitech) that includes a wireless alarm system with a central control panel, door and window sensors, environmental sensors, keypads, and other accessories. The system can be used to monitor and detect unauthorized entry and exit, detect carbon monoxide and smoke, monitor temperature, and detect other environmental hazards. It also comes with a 24/7 monitoring service and can be connected to an additional monitoring service, such as an alarm monitoring center.