A commercial grade, dual beam infra red sensor housed in a water & dust proof housing for alarm/access control integration. Triggers when beam breaks. Dual infra-red beams are used in conjunction with a fresnel lens for reduced false triggering. Suitable for use in alarm or customer counting applications. 40m range.NO/NC trigger output. Adjustable beam 180° horizontal, 20° vertical. Requires DC 11-18V power.