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Qigong School Airport Entrance Access Control Security Solution Automatic Hydraulic Retractable Bollard. 1.Stainless Steel Construction: Durability and resistance to corrosion for long-term use. 2.Customizable Size: Meets client-specific needs for precise installation. 3.Remote Control Capability: Easy management via Bluetooth, APP, or 5G. 4.Water Fillable Design: Enhances safety by absorbing impact energy during collisions.