http://www.alibaba.com/rss/product_search/Beeper.rss Marketplace of export & import, offers company directory, catalog, trade leads to importer, exporter, manufacturer, wholesaler. en-us alibaba http://www.alibaba.com/product-gs/277973052/Low_cost_Parking_sensor.html Low cost Parking sensor <br>Rear 4 sensor for full rear coverge; <br>Ultra-slim LED left/right obstacle display; <br>Beeper warning.