Yes indeed, I proposed a long time ago to have four computers for three dimensional triangulation to track the DL2000 within a 3D space, probably a house and that any number of zones could be set up. This new idea is of course easier to implement for DL-Labs and could be another product, a DL-Link re-programmed as a stand alone device to act as a repellant. Maybe with a USB hub as a power supply. I can imagine it being used near doors and windows, the telephone, TV, radio, drinks cabinet, Mistress' handbag and the workshop or anywhere tools might be available. as well as a full DL-Link on the computer running my controlling software so I can't mess with it. When the wearer has been naughty he could even be kept away from the toilet perhaps.