Script fullperm.
Insert in your detector.
This script allows you to monitor on a terrain defined by you (maximum allowed size of an object).The ground can also be a transparent object.
You can decide whether to send a message to the avatars who enter the area.
You can choose the message.
You will receive an IM every new avatar spotted.
The names of the avatars are registered on a list that you can view with a password (you can choose password and secret channel), you can delete the list with a second password
Cannot Phantom it
There is no notecard, all the directions are in the script itself so you'll need at least a little bit of knowledge on how scripts work, but only a very little. You only edit the text between the " "s. It responds to collision so did not work when I made it phantom but did once I set it back to Solid. Being solid any thieves might notice the slight bump but not much I can do about that.