Some Do-it-yourself security methods may possibly feature a base and 1 or 2 sensors while others, such as Ring Alarm Pro, have 4 sensors, a movement sensor and a spread extender. At minimal, you need a package with motion sensors, door and window sensors and also a Management box. https://simplisafe-security19141.ampblogs.com/diy-smart-home-security-for-dummies-69231713