The AP81 sensor belongs to the AP8-series K-band sensors designed for general mid-range applications. The design optimizes range, detection angle and cost in a low profile package. Designed with dual-channels, the AP8-series sensors are able to discriminate target direction. Typical applications include radar speed signs, traffic monitoring, sports radars. security detectors, vehicle blind-spot detectors and other applications that require general motion detection with an extended range.