Abstract: This disclosure describes, in part, techniques for implementing customized intrusion zones for security monitoring. For instance, a user may provide (e.g., via a GUI) an indication of a physical space to be monitored. An electronic device may detect one or more objects and its respective location from radar data collected by a radar sensor. The electronic device may additionally detect one or more objects within image data captured via a camera. The electronic device may then analyze the radar data and the image data in order to determine that the object detected by the radar sensor includes the same object represented by the image data. As such, the electronic device may send an alert to one or more computing devices that may include the radar data and/or the image data.