PB-30HD/60HD/80HD/120HD Twin Photoelectric Beam Detector - Reliable Perimeter security and protection. - Laser beam alignment function - Twin beam:Minimizing false alarm, for falling leaves, birds, small animal--etc. - Weather proof:Anti-rain, snow, dew, mist, frost--etc. - Range: PB-30HD: Outdoor 30m, Indoor 60m PB-60HD: Outdoor 60m, Indoor 120m PB-80HD: Outdoor 80m, Indoor 160m PB-60HD: Outdoor 120m, Indoor 240m - CE approved. - IP-55 water proof. - Automatic input power filtering. - Easy, quick installation.