Schell Electronics will custom design a transmitter to fit your surveillance situation. Our products include: A Motion Detector/Signaling transmitter that is motion and or trip wire activated, designed for monitoring controlled deliveries. A Motion/Light Detector/Signaling transmitter activated with still, motion and alarm (light detect) modes. Designed for monitoring controlled deliveries. Contact us: 620-431-2350 or www.schellelectronics.net