... 6~9V;Working Temperature: 5~~+55Humidity: 5%~~95% RH;IP Level: IP64;Dimension: 413*143*52mm/pc;Weight: 0.45kg ... 4cm.Where to use:Airport, station, dock for security check;Custom, police, border, security, government department;Bank, hotel, KTV, club, entertainment ... industry for quality inspection;Big event, sports, Fair, for security check;Noble metal detecting, in gold, silver or jewelry industry ...