STR International RADIY2 The STRADIY-2 Series are high end microwave radar-sensors a ranges of 164, 328, or 655 feet with a 5, 7, or 16 foot wide beam. Their ability to work in extreme temperatures (-58 to 149 F) and it's economical power consumption (70mA) make these units stand out in the field! Radiy series detectors use the Doppler effect and digital analysis of the Doppler waves to detect intruders. These detectors are designed to monitor their protected zone for movement and continuously “learn” and adjust to changing weather and terrain conditions. The alarm sounds if person moves within the protected zone, the unit's case is opened or powered off, and if power reduces under 10.2 volts DC Kits come complete with transmitter, receiver, and mounting hardware!