Taggertrap is an emergency-lighting box that has an audio sensor tuned to the sound of a spraypaint can in action. When it detects nearby graffiti writers, it activates a silent alarm, ratting the taggers out to the cops.
The mobile unit (Stinger) is battery powered, augmented by solar energy and may be linked with other surveillance or communication equipment, including cell phones, pagers, or, in remote locations like national parks, by GPS. The fixed unit (Surveyor) may be linked with existing alarm systems.