Outer Realms Pod
This works on the same principle as most trigger props and pods. It creates a field around the antenna and anything that breaks the field will light up the pod and trigger an audible alarm. We have this by a doorway in the store and it triggers every time someone enters the room and other times when no one is there :) It’s a larger pod so you wont miss the glow or the sound. The antenna is a flexible antenna so no breakage. It runs on one 9v battery not included.