... .5m (alarm from 1.5m)Ultrasonic frequency 40KHzWorking temperature -30ºC ~ +80ºCDisplay size 79*28*20mmProduct introduction 1) Three color ... /OEM/ODMPlace of origin Guangdong, China (Mainland)Payment Terms L/C, T/T, Western Union,PaypalFOB Port Guangzhou / ChinaMinimum Order 1 ... Europe, the US, the Middle East, Saudi Arabia, and Brazil. 2012 hot selling parking sensor system