OPTEX detector, outdoor pir redwall radio 30x20m antimasking. vandal-resistant, c, coverage 30m x 20m. mounting height: 2.3, 4m., power supply: lithium or alkaline battery, antimasking. vandal-resistant. anti-rotation. 2 detection zones, ambient temperature and lighting detection. coverage adjustment. sensitivity selector, alarm relay and tamper against sabotage. fault output. ip65