... )While arm moving down, If infrared transportation between transmitter and receiver is blocked by human or vehicle, the arm will go ... : relay NO output, AC220V/0.5A, DV 12V/1A8) Wireless remoter(optional): two button remote transmitter, distance>20m9) RS 485 ... c; Humidity:10%-95%ApplicationsThis boom barrier provides a scure and convenient solution in shopping center, exhibition center, hospitals, ...