causing material: Aluminum + PC plastic Window barrier can be installed at door, window, passage, etc With high-grade aluminum alloy shell, selection of components and the overall stability is good, high reliability, strong anti-jamming capability Wired, suitable for different occasions, and can be compatible with any brand alarm host With rain, fog, snow, all-weather outdoor use Tamper proof and shear, mobile, double-beam recognition principle to prevent small animals, birds, and other small objects causing false-positives Stepless rotate 360 degrees, fast accurate focus, unique terminals, convenient installation and debugging High Sensitivity, vigilance to prevent from three gears adjustable, AGC circuit design Easy to wiring, alignment or not have buzzer sound instructions Scope of application: senior villas, families, companies, financial institutions, clubs, etc.