STR International Volumetric Microwave Perimeter Intrusion Detector The STR AGAT-S6 is a microwave radar-sensor with a range of 13 to 65 feet with a 50 foot wide beam. This detector is designed to monitor it's protected zone for movement and continuously “learn” and adjust to changing weather and terrain conditions including grass and snow up to 1 foot! The alarm sounds if person moves within the protected zone, if the unit's case is opened or powered off, and if power reduces under 10.2 volts DC. Agat series are volumetric detectors, constantly sensing mass and size in the protected field, making them perfect for protecting enclosures, small foot print areas, backyard or apartment swimming pools, rooftops and helipads! Below, you can see an example of a helipad being protected. Kits come complete with transmitter, receiver, and mounting hardware!