SECO-LARM’s ENFORCER E-964-D390Q Multi-Frequency Twin Photobeam Detector features four selectable channel frequencies, and provides enhanced perimeter protection by reducing crosstalk between multiple units. A built-in laser-alignment system ensures installation is quick and easy. The E-964-D390Q has a range of up to 390' (120m) while twin beams provide reliable perimeter security, minimizing false alarms from falling leaves, birds etc. The detector features lensed optics to reinforce beam strength and provide excellent immunity to false alarms due to rain, snow, mist, etc.