The DS-K3B601SX series swing barrier with 20 pairs of IR lights is designed to detect unauthorized entrance or exit. By adopting the swing barrier integratedly with the access control system, person should authenticate to pass through the lane via swiping IC or ID card, scanning QR code, etc. It is widely used in attractions, stadiums, construction sites, residences, etc. 20 pairs of IR light detectors: Permissions validation and anti-tailgating LED light indicates passing direction Audible and visual nipping alarm: The barrier will stop working for a period of time when detecting obstruction when open/close barrier Self-detection, Self-diagnostics, and automatic alarm Valid passing duration settings: System will cancel the passing permission if a person does not pass through the lane within the valid passing duration Door remaining open when fire alarm triggered: The barrier will open automatically when alarm is triggered. Barrier is in free status when powering down