These compact, easy to install, passive infra red detectors offer excellent movement detection for alarm systems at an affordable price. They feature NC or NO contact output (30V DC @ 0.2A max), 2/3 selectable pulse count and 12m detection range. An internal tamper switch ensures units cannot be deactivated by intruders. The pet immune model ignores movement from animals up to 18kg in weight and 60cm in height. The housing has internal screw recesses which can be drilled through for horizontal mounting. Not to be used with a bracket.